21901770552 has 16 divisors (see below), whose sum is σ = 54754426440. Its totient is φ = 7300590176.

The previous prime is 21901770523. The next prime is 21901770577. The reversal of 21901770552 is 25507710912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21901770552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456286863 + ... + 456286910.

Almost surely, 2^21901770552 is an apocalyptic number.

It is an amenable number.

21901770552 is an abundant number, since it is smaller than the sum of its proper divisors (32852655888).

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

21901770552 is a wasteful number, since it uses less digits than its factorization.

21901770552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912573782 (or 912573778 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 39.

The spelling of 21901770552 in words is "twenty-one billion, nine hundred one million, seven hundred seventy thousand, five hundred fifty-two".