21031000331 has 16 divisors (see below), whose sum is σ = 23389648128. Its totient is φ = 18747237600.

The previous prime is 21031000283. The next prime is 21031000351. The reversal of 21031000331 is 13300013012.

It is a cyclic number.

It is not a de Polignac number, because 21031000331 - 2¹⁸ = 21030738187 is a prime.

It is a super-2 number, since 2×21031000331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21031000351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1067036 + ... + 1086566.

It is an arithmetic number, because the mean of its divisors is an integer number (1461853008).

Almost surely, 2^21031000331 is an apocalyptic number.

21031000331 is a deficient number, since it is larger than the sum of its proper divisors (2358647797).

21031000331 is a wasteful number, since it uses less digits than its factorization.

21031000331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21442.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21031000331 its reverse (13300013012), we get a palindrome (34331013343).

The spelling of 21031000331 in words is "twenty-one billion, thirty-one million, three hundred thirty-one", and thus it is an aban number.