21855396950 has 144 divisors (see below), whose sum is σ = 45179347920. Its totient is φ = 7843080960.

The previous prime is 21855396943. The next prime is 21855397027. The reversal of 21855396950 is 5969355812.

It is a junction number, because it is equal to n+sod(n) for n = 21855396892 and 21855396901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 78900212 + ... + 78900488.

Almost surely, 2^21855396950 is an apocalyptic number.

21855396950 is an abundant number, since it is smaller than the sum of its proper divisors (23323950970).

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

21855396950 is a wasteful number, since it uses less digits than its factorization.

21855396950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 21855396950 in words is "twenty-one billion, eight hundred fifty-five million, three hundred ninety-six thousand, nine hundred fifty".