21031133013 has 24 divisors (see below), whose sum is σ = 33144785856. Its totient is φ = 12744288000.

The previous prime is 21031133009. The next prime is 21031133029. The reversal of 21031133013 is 31033113012.

It is a happy number.

21031133013 is a `hidden beast` number, since 2 + 10 + 311 + 330 + 13 = 666.

It is not a de Polignac number, because 21031133013 - 2² = 21031133009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031133113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1013088 + ... + 1033638.

It is an arithmetic number, because the mean of its divisors is an integer number (1381032744).

Almost surely, 2^21031133013 is an apocalyptic number.

It is an amenable number.

21031133013 is a deficient number, since it is larger than the sum of its proper divisors (12113652843).

21031133013 is a wasteful number, since it uses less digits than its factorization.

21031133013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30905 (or 30902 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21031133013 its reverse (31033113012), we get a palindrome (52064246025).

The spelling of 21031133013 in words is "twenty-one billion, thirty-one million, one hundred thirty-three thousand, thirteen".