21430409234 has 32 divisors (see below), whose sum is σ = 34924048320. Its totient is φ = 9803851200.

The previous prime is 21430409233. The next prime is 21430409239. The reversal of 21430409234 is 43290403412.

It is a self number, because there is not a number n which added to its sum of digits gives 21430409234.

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 15 ways as a sum of consecutive naturals, for example, 2384369 + ... + 2393339.

It is an arithmetic number, because the mean of its divisors is an integer number (1091376510).

Almost surely, 2^21430409234 is an apocalyptic number.

21430409234 is a deficient number, since it is larger than the sum of its proper divisors (13493639086).

21430409234 is a wasteful number, since it uses less digits than its factorization.

21430409234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9786.

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 21430409234 in words is "twenty-one billion, four hundred thirty million, four hundred nine thousand, two hundred thirty-four".