21606555642150 has 48 divisors (see below), whose sum is σ = 53657360936784. Its totient is φ = 5753887639680.

The previous prime is 21606555642131. The next prime is 21606555642209. The reversal of 21606555642150 is 5124655560612.

It is a self number, because there is not a number n which added to its sum of digits gives 21606555642150.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98146329 + ... + 98366228.

It is an arithmetic number, because the mean of its divisors is an integer number (1117861686183).

Almost surely, 2^{21606555642150} is an apocalyptic number.

21606555642150 is an abundant number, since it is smaller than the sum of its proper divisors (32050805294634).

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

21606555642150 is a wasteful number, since it uses less digits than its factorization.

21606555642150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196513305 (or 196513300 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 48.

The spelling of 21606555642150 in words is "twenty-one trillion, six hundred six billion, five hundred fifty-five million, six hundred forty-two thousand, one hundred fifty".