21222720232 has 16 divisors (see below), whose sum is σ = 45477257760. Its totient is φ = 9095451504.

The previous prime is 21222720163. The next prime is 21222720251. The reversal of 21222720232 is 23202722212.

It is a junction number, because it is equal to n+sod(n) for n = 21222720197 and 21222720206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189488518 + ... + 189488629.

It is an arithmetic number, because the mean of its divisors is an integer number (2842328610).

Almost surely, 2^21222720232 is an apocalyptic number.

It is an amenable number.

21222720232 is an abundant number, since it is smaller than the sum of its proper divisors (24254537528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222720232 is a wasteful number, since it uses less digits than its factorization.

21222720232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378977160 (or 378977156 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The spelling of 21222720232 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty thousand, two hundred thirty-two".