21310633652 has 48 divisors (see below), whose sum is σ = 46603600512. Its totient is φ = 8283617280.

The previous prime is 21310633637. The next prime is 21310633657. The reversal of 21310633652 is 25633601312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310633657) 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, 53468 + ... + 213260.

It is an arithmetic number, because the mean of its divisors is an integer number (970908344).

Almost surely, 2^21310633652 is an apocalyptic number.

21310633652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21310633652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23301800256).

21310633652 is an abundant number, since it is smaller than the sum of its proper divisors (25292966860).

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

21310633652 is a wasteful number, since it uses less digits than its factorization.

21310633652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160248 (or 160246 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 32.

The spelling of 21310633652 in words is "twenty-one billion, three hundred ten million, six hundred thirty-three thousand, six hundred fifty-two".