21970650650 has 72 divisors (see below), whose sum is σ = 44535251124. Its totient is φ = 8060083200.

The previous prime is 21970650649. The next prime is 21970650671. The reversal of 21970650650 is 5605607912.

It can be written as a sum of positive squares in 18 ways, for example, as 14060504929 + 7910145721 = 118577^2 + 88939^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21970650598 and 21970650607.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1318370 + ... + 1334930.

Almost surely, 2^21970650650 is an apocalyptic number.

21970650650 is an abundant number, since it is smaller than the sum of its proper divisors (22564600474).

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

21970650650 is a wasteful number, since it uses less digits than its factorization.

21970650650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16756 (or 16738 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 21970650650 in words is "twenty-one billion, nine hundred seventy million, six hundred fifty thousand, six hundred fifty".