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2101011021 = 3377815223
BaseRepresentation
bin111110100111010…
…1110001001001101
312102102102102022000
41331032232021031
513300324323041
6544251542513
7103031204364
oct17516561115
95372372260
102101011021
11988a6974a
124a775aa39
132763830b5
1415d0707db
15c46b6bb6
hex7d3ae24d

2101011021 has 8 divisors (see below), whose sum is σ = 3112608960. Its totient is φ = 1400673996.

The previous prime is 2101010987. The next prime is 2101011047. The reversal of 2101011021 is 1201101012.

It is a happy number.

It is not a de Polignac number, because 2101011021 - 27 = 2101010893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2101010994 and 2101011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101011091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38907585 + ... + 38907638.

It is an arithmetic number, because the mean of its divisors is an integer number (389076120).

Almost surely, 22101011021 is an apocalyptic number.

It is an amenable number.

2101011021 is a deficient number, since it is larger than the sum of its proper divisors (1011597939).

2101011021 is an equidigital number, since it uses as much as digits as its factorization.

2101011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77815232 (or 77815226 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2101011021 is about 45836.7867656536. The cubic root of 2101011021 is about 1280.7846387513.

Adding to 2101011021 its reverse (1201101012), we get a palindrome (3302112033).

The spelling of 2101011021 in words is "two billion, one hundred one million, eleven thousand, twenty-one".

Divisors: 1 3 9 27 77815223 233445669 700337007 2101011021