Search a number
-
+
1012021021 = 1192001911
BaseRepresentation
bin111100010100100…
…011011100011101
32121112021222212001
4330110203130131
54033034133041
6244231042301
734036015414
oct7424433435
92545258761
101012021021
1147a294410
12242b10391
1313188890b
149859a47b
155dca8131
hex3c52371d

1012021021 has 4 divisors (see below), whose sum is σ = 1104022944. Its totient is φ = 920019100.

The previous prime is 1012021019. The next prime is 1012021027. The reversal of 1012021021 is 1201202101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1201202101 = 11109200191.

It is not a de Polignac number, because 1012021021 - 21 = 1012021019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012020989 and 1012021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012021027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46000945 + ... + 46000966.

It is an arithmetic number, because the mean of its divisors is an integer number (276005736).

Almost surely, 21012021021 is an apocalyptic number.

1012021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1012021021 is a deficient number, since it is larger than the sum of its proper divisors (92001923).

1012021021 is an equidigital number, since it uses as much as digits as its factorization.

1012021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92001922.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1012021021 is about 31812.2778341948. The cubic root of 1012021021 is about 1003.9910572713.

Adding to 1012021021 its reverse (1201202101), we get a palindrome (2213223122).

The spelling of 1012021021 in words is "one billion, twelve million, twenty-one thousand, twenty-one".

Divisors: 1 11 92001911 1012021021