21402889231 has 2 divisors, whose sum is σ = 21402889232. Its totient is φ = 21402889230.

The previous prime is 21402889219. The next prime is 21402889237. The reversal of 21402889231 is 13298820412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21402889231 - 2⁷ = 21402889103 is a prime.

It is a super-2 number, since 2×21402889231² (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 (21402889237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701444615 + 10701444616.

It is an arithmetic number, because the mean of its divisors is an integer number (10701444616).

Almost surely, 2^21402889231 is an apocalyptic number.

21402889231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402889231 is an equidigital number, since it uses as much as digits as its factorization.

21402889231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 21402889231 in words is "twenty-one billion, four hundred two million, eight hundred eighty-nine thousand, two hundred thirty-one".