21442523652 has 36 divisors (see below), whose sum is σ = 59129384496. Its totient is φ = 6497734320.

The previous prime is 21442523647. The next prime is 21442523653. The reversal of 21442523652 is 25632524412.

21442523652 is a `hidden beast` number, since 2 + 1 + 44 + 252 + 365 + 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 not an unprimeable number, because it can be changed into a prime (21442523653) 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, 27073498 + ... + 27074289.

Almost surely, 2^21442523652 is an apocalyptic number.

21442523652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21442523652 is an abundant number, since it is smaller than the sum of its proper divisors (37686860844).

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

21442523652 is a wasteful number, since it uses less digits than its factorization.

21442523652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54147808 (or 54147803 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The spelling of 21442523652 in words is "twenty-one billion, four hundred forty-two million, five hundred twenty-three thousand, six hundred fifty-two".