21225312600 has 96 divisors (see below), whose sum is σ = 69669000720. Its totient is φ = 5327134720.

The previous prime is 21225312587. The next prime is 21225312613. The reversal of 21225312600 is 621352212.

It is an interprime number because it is at equal distance from previous prime (21225312587) and next prime (21225312613).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1030257 + ... + 1050656.

Almost surely, 2^21225312600 is an apocalyptic number.

21225312600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21225312600 is an abundant number, since it is smaller than the sum of its proper divisors (48443688120).

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

21225312600 is a wasteful number, since it uses less digits than its factorization.

21225312600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080949 (or 2080940 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21225312600 its reverse (621352212), we get a palindrome (21846664812).

The spelling of 21225312600 in words is "twenty-one billion, two hundred twenty-five million, three hundred twelve thousand, six hundred".