21031023013 has 16 divisors (see below), whose sum is σ = 28237458816. Its totient is φ = 15127208640.

The previous prime is 21031023001. The next prime is 21031023023. The reversal of 21031023013 is 31032013012.

It is a cyclic number.

It is not a de Polignac number, because 21031023013 - 2²¹ = 21028925861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031023023) 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 15 ways as a sum of consecutive naturals, for example, 10504006 + ... + 10506007.

It is an arithmetic number, because the mean of its divisors is an integer number (1764841176).

Almost surely, 2^21031023013 is an apocalyptic number.

It is an amenable number.

21031023013 is a deficient number, since it is larger than the sum of its proper divisors (7206435803).

21031023013 is a wasteful number, since it uses less digits than its factorization.

21031023013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21010044.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21031023013 its reverse (31032013012), we get a palindrome (52063036025).

The spelling of 21031023013 in words is "twenty-one billion, thirty-one million, twenty-three thousand, thirteen".