21525627606 has 32 divisors (see below), whose sum is σ = 49275932928. Its totient is φ = 6140867040.

The previous prime is 21525627581. The next prime is 21525627689. The reversal of 21525627606 is 60672652512.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359920 + ... + 415443.

It is an arithmetic number, because the mean of its divisors is an integer number (1539872904).

Almost surely, 2^21525627606 is an apocalyptic number.

21525627606 is an abundant number, since it is smaller than the sum of its proper divisors (27750305322).

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

21525627606 is a wasteful number, since it uses less digits than its factorization.

21525627606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776036.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 21525627606 in words is "twenty-one billion, five hundred twenty-five million, six hundred twenty-seven thousand, six hundred six".