21625244652 has 48 divisors (see below), whose sum is σ = 56084700672. Its totient is φ = 6429458880.

The previous prime is 21625244651. The next prime is 21625244671. The reversal of 21625244652 is 25644252612.

It is a super-2 number, since 2×21625244652² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21625244652.

It is not an unprimeable number, because it can be changed into a prime (21625244651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1538548 + ... + 1552539.

It is an arithmetic number, because the mean of its divisors is an integer number (1168431264).

Almost surely, 2^21625244652 is an apocalyptic number.

21625244652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21625244652 is an abundant number, since it is smaller than the sum of its proper divisors (34459456020).

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

21625244652 is a wasteful number, since it uses less digits than its factorization.

21625244652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091158 (or 3091156 counting only the distinct ones).

The product of its digits is 230400, while the sum is 39.

The spelling of 21625244652 in words is "twenty-one billion, six hundred twenty-five million, two hundred forty-four thousand, six hundred fifty-two".