21200551450 has 72 divisors (see below), whose sum is σ = 43124171796. Its totient is φ = 7750080000.

The previous prime is 21200551439. The next prime is 21200551513. The reversal of 21200551450 is 5415500212.

It can be written as a sum of positive squares in 18 ways, for example, as 4903220529 + 16297330921 = 70023^2 + 127661^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 841030 + ... + 865870.

Almost surely, 2^21200551450 is an apocalyptic number.

21200551450 is an abundant number, since it is smaller than the sum of its proper divisors (21923620346).

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

21200551450 is a wasteful number, since it uses less digits than its factorization.

21200551450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24980 (or 24962 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 21200551450 in words is "twenty-one billion, two hundred million, five hundred fifty-one thousand, four hundred fifty".