21140432311 has 16 divisors (see below), whose sum is σ = 21646684800. Its totient is φ = 20640672000.

The previous prime is 21140432309. The next prime is 21140432317. The reversal of 21140432311 is 11323404112.

It is a cyclic number.

It is not a de Polignac number, because 21140432311 - 2¹ = 21140432309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140432317) 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, 11816005 + ... + 11817793.

It is an arithmetic number, because the mean of its divisors is an integer number (1352917800).

Almost surely, 2^21140432311 is an apocalyptic number.

21140432311 is a deficient number, since it is larger than the sum of its proper divisors (506252489).

21140432311 is a wasteful number, since it uses less digits than its factorization.

21140432311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3450.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21140432311 its reverse (11323404112), we get a palindrome (32463836423).

The spelling of 21140432311 in words is "twenty-one billion, one hundred forty million, four hundred thirty-two thousand, three hundred eleven".