21522605652 has 36 divisors (see below), whose sum is σ = 54413704800. Its totient is φ = 7172970192.

The previous prime is 21522605651. The next prime is 21522605717. The reversal of 21522605652 is 25650622512.

21522605652 is a `hidden beast` number, since 2 + 15 + 22 + 60 + 565 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522605651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174943 + ... + 271385.

It is an arithmetic number, because the mean of its divisors is an integer number (1511491800).

Almost surely, 2^21522605652 is an apocalyptic number.

It is an amenable number.

21522605652 is an abundant number, since it is smaller than the sum of its proper divisors (32891099148).

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

21522605652 is a wasteful number, since it uses less digits than its factorization.

21522605652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102652 (or 102647 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 21522605652 in words is "twenty-one billion, five hundred twenty-two million, six hundred five thousand, six hundred fifty-two".