21430409231 has 32 divisors (see below), whose sum is σ = 27114447360. Its totient is φ = 16453238400.

The previous prime is 21430409227. The next prime is 21430409233. The reversal of 21430409231 is 13290403412.

It is a cyclic number.

It is not a de Polignac number, because 21430409231 - 2² = 21430409227 is a prime.

It is a super-2 number, since 2×21430409231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21430409194 and 21430409203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430409233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1512080 + ... + 1526186.

It is an arithmetic number, because the mean of its divisors is an integer number (847326480).

Almost surely, 2^21430409231 is an apocalyptic number.

21430409231 is a deficient number, since it is larger than the sum of its proper divisors (5684038129).

21430409231 is a wasteful number, since it uses less digits than its factorization.

21430409231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14415.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21430409231 in words is "twenty-one billion, four hundred thirty million, four hundred nine thousand, two hundred thirty-one".