21525030200 has 48 divisors (see below), whose sum is σ = 50352800280. Its totient is φ = 8557176960.

The previous prime is 21525030193. The next prime is 21525030221. The reversal of 21525030200 is 203052512.

It is a super-2 number, since 2×21525030200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297539 + ... + 362738.

Almost surely, 2^21525030200 is an apocalyptic number.

21525030200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525030200 is an abundant number, since it is smaller than the sum of its proper divisors (28827770080).

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

21525030200 is a wasteful number, since it uses less digits than its factorization.

21525030200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660456 (or 660447 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 21525030200 its reverse (203052512), we get a palindrome (21728082712).

The spelling of 21525030200 in words is "twenty-one billion, five hundred twenty-five million, thirty thousand, two hundred".