21321544050 has 72 divisors (see below), whose sum is σ = 57302871444. Its totient is φ = 5683860480.

The previous prime is 21321544003. The next prime is 21321544063. The reversal of 21321544050 is 5044512312.

21321544050 is a `hidden beast` number, since 2 + 1 + 3 + 215 + 440 + 5 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 5067588969 + 16253955081 = 71187^2 + 127491^2 .

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, 1827034 + ... + 1838666.

Almost surely, 2^21321544050 is an apocalyptic number.

21321544050 is an abundant number, since it is smaller than the sum of its proper divisors (35981327394).

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

21321544050 is a wasteful number, since it uses less digits than its factorization.

21321544050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15724 (or 15716 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21321544050 in words is "twenty-one billion, three hundred twenty-one million, five hundred forty-four thousand, fifty".