21222741536 has 24 divisors (see below), whose sum is σ = 42152034204. Its totient is φ = 10517463040.

The previous prime is 21222741511. The next prime is 21222741541. The reversal of 21222741536 is 63514722212.

It can be written as a sum of positive squares in 2 ways, for example, as 19893409936 + 1329331600 = 141044^2 + 36460^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21222741496 and 21222741505.

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, 2930945 + ... + 2938176.

Almost surely, 2^21222741536 is an apocalyptic number.

It is an amenable number.

21222741536 is a deficient number, since it is larger than the sum of its proper divisors (20929292668).

21222741536 is a wasteful number, since it uses less digits than its factorization.

21222741536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5869244 (or 5869236 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The spelling of 21222741536 in words is "twenty-one billion, two hundred twenty-two million, seven hundred forty-one thousand, five hundred thirty-six".