21132111013 has 12 divisors (see below), whose sum is σ = 22895085348. Its totient is φ = 19496006400.

The previous prime is 21132110999. The next prime is 21132111023. The reversal of 21132111013 is 31011123112.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 5910226884 + 15221884129 = 76878^2 + 123377^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21132111013 is a prime.

It is a super-2 number, since 2×21132111013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132111023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288381 + ... + 354157.

It is an arithmetic number, because the mean of its divisors is an integer number (1907923779).

Almost surely, 2^21132111013 is an apocalyptic number.

It is an amenable number.

21132111013 is a deficient number, since it is larger than the sum of its proper divisors (1762974335).

21132111013 is a wasteful number, since it uses less digits than its factorization.

21132111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67704 (or 67691 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21132111013 its reverse (31011123112), we get a palindrome (52143234125).

The spelling of 21132111013 in words is "twenty-one billion, one hundred thirty-two million, one hundred eleven thousand, thirteen".