21132011231 has 16 divisors (see below), whose sum is σ = 22380738048. Its totient is φ = 19911276000.

The previous prime is 21132011213. The next prime is 21132011239. The reversal of 21132011231 is 13211023112.

It is a cyclic number.

It is not a de Polignac number, because 21132011231 - 2¹⁴ = 21131994847 is a prime.

It is a super-2 number, since 2×21132011231² (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 (21132011239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2129381 + ... + 2139281.

It is an arithmetic number, because the mean of its divisors is an integer number (1398796128).

Almost surely, 2^21132011231 is an apocalyptic number.

21132011231 is a deficient number, since it is larger than the sum of its proper divisors (1248726817).

21132011231 is a wasteful number, since it uses less digits than its factorization.

21132011231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11302.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21132011231 its reverse (13211023112), we get a palindrome (34343034343).

The spelling of 21132011231 in words is "twenty-one billion, one hundred thirty-two million, eleven thousand, two hundred thirty-one".