21023111013 has 32 divisors (see below), whose sum is σ = 31268044800. Its totient is φ = 12486203136.

The previous prime is 21023111009. The next prime is 21023111077. The reversal of 21023111013 is 31011132012.

It is a happy number.

It is not a de Polignac number, because 21023111013 - 2² = 21023111009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21023110983 and 21023111001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023111093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1230870 + ... + 1247832.

It is an arithmetic number, because the mean of its divisors is an integer number (977126400).

Almost surely, 2^21023111013 is an apocalyptic number.

It is an amenable number.

21023111013 is a deficient number, since it is larger than the sum of its proper divisors (10244933787).

21023111013 is a wasteful number, since it uses less digits than its factorization.

21023111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18281.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21023111013 its reverse (31011132012), we get a palindrome (52034243025).

The spelling of 21023111013 in words is "twenty-one billion, twenty-three million, one hundred eleven thousand, thirteen".