21255502151250 has 120 divisors (see below), whose sum is σ = 57661641102780. Its totient is φ = 5656996560000.

The previous prime is 21255502151239. The next prime is 21255502151291. The reversal of 21255502151250 is 5215120555212.

21255502151250 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 550 + 2 + 1 + 51 + 2 + 50 = 666.

It can be written as a sum of positive squares in 10 ways, for example, as 672231090609 + 20583271060641 = 819897^2 + 4536879^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3870280 + ... + 7582220.

Almost surely, 2^{21255502151250} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21255502151250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28830820551390).

21255502151250 is an abundant number, since it is smaller than the sum of its proper divisors (36406138951530).

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

21255502151250 is a wasteful number, since it uses less digits than its factorization.

21255502151250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3712478 (or 3712460 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 36.

The spelling of 21255502151250 in words is "twenty-one trillion, two hundred fifty-five billion, five hundred two million, one hundred fifty-one thousand, two hundred fifty".