21012000331 has 16 divisors (see below), whose sum is σ = 24106199040. Its totient is φ = 17941060800.

The previous prime is 21012000311. The next prime is 21012000349. The reversal of 21012000331 is 13300021012.

It is a cyclic number.

It is not a de Polignac number, because 21012000331 - 2²¹ = 21009903179 is a prime.

It is a super-2 number, since 2×21012000331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012000311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2009940 + ... + 2020366.

It is an arithmetic number, because the mean of its divisors is an integer number (1506637440).

Almost surely, 2^21012000331 is an apocalyptic number.

21012000331 is a deficient number, since it is larger than the sum of its proper divisors (3094198709).

21012000331 is a wasteful number, since it uses less digits than its factorization.

21012000331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11514.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21012000331 its reverse (13300021012), we get a palindrome (34312021343).

The spelling of 21012000331 in words is "twenty-one billion, twelve million, three hundred thirty-one", and thus it is an aban number.