1012101021 has 8 divisors (see below), whose sum is σ = 1499408960. Its totient is φ = 674733996.

The previous prime is 1012101011. The next prime is 1012101037. The reversal of 1012101021 is 1201012101.

It is a happy number.

It is not a de Polignac number, because 1012101021 - 2¹⁴ = 1012084637 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012100994 and 1012101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012101011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18742585 + ... + 18742638.

It is an arithmetic number, because the mean of its divisors is an integer number (187426120).

Almost surely, 2^1012101021 is an apocalyptic number.

It is an amenable number.

1012101021 is a deficient number, since it is larger than the sum of its proper divisors (487307939).

1012101021 is an equidigital number, since it uses as much as digits as its factorization.

1012101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37485232 (or 37485226 counting only the distinct ones).

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

The square root of 1012101021 is about 31813.5351855150. The cubic root of 1012101021 is about 1004.0175116520.

Adding to 1012101021 its reverse (1201012101), we get a palindrome (2213113122).

The spelling of 1012101021 in words is "one billion, twelve million, one hundred one thousand, twenty-one".