21775492452 has 72 divisors (see below), whose sum is σ = 59519201728. Its totient is φ = 6069784320.

The previous prime is 21775492379. The next prime is 21775492477. The reversal of 21775492452 is 25429457712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64098 + ... + 218310.

Almost surely, 2^21775492452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21775492452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29759600864).

21775492452 is an abundant number, since it is smaller than the sum of its proper divisors (37743709276).

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

21775492452 is a wasteful number, since it uses less digits than its factorization.

21775492452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154309 (or 154266 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 48.

The spelling of 21775492452 in words is "twenty-one billion, seven hundred seventy-five million, four hundred ninety-two thousand, four hundred fifty-two".