21432216530 has 16 divisors (see below), whose sum is σ = 38581475904. Its totient is φ = 8572111920.

The previous prime is 21432216527. The next prime is 21432216541. The reversal of 21432216530 is 3561223412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21432216493 and 21432216502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26885 + ... + 208775.

It is an arithmetic number, because the mean of its divisors is an integer number (2411342244).

Almost surely, 2^21432216530 is an apocalyptic number.

21432216530 is a deficient number, since it is larger than the sum of its proper divisors (17149259374).

21432216530 is a wasteful number, since it uses less digits than its factorization.

21432216530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193681.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 21432216530 its reverse (3561223412), we get a palindrome (24993439942).

The spelling of 21432216530 in words is "twenty-one billion, four hundred thirty-two million, two hundred sixteen thousand, five hundred thirty".