21132304231 has 2 divisors, whose sum is σ = 21132304232. Its totient is φ = 21132304230.

The previous prime is 21132304217. The next prime is 21132304243. The reversal of 21132304231 is 13240323112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21132304231 - 2¹⁷ = 21132173159 is a prime.

It is a super-2 number, since 2×21132304231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21132304201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566152115 + 10566152116.

It is an arithmetic number, because the mean of its divisors is an integer number (10566152116).

Almost surely, 2^21132304231 is an apocalyptic number.

21132304231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132304231 is an equidigital number, since it uses as much as digits as its factorization.

21132304231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21132304231 its reverse (13240323112), we get a palindrome (34372627343).

The spelling of 21132304231 in words is "twenty-one billion, one hundred thirty-two million, three hundred four thousand, two hundred thirty-one".