21606604650054 has 24 divisors (see below), whose sum is σ = 46815770216280. Its totient is φ = 7201976912928.

The previous prime is 21606604650031. The next prime is 21606604650061. The reversal of 21606604650054 is 45005640660612.

21606604650054 is a `hidden beast` number, since 21 + 60 + 6 + 60 + 4 + 6 + 500 + 5 + 4 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21606604649991 and 21606604650009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18126112 + ... + 19281315.

It is an arithmetic number, because the mean of its divisors is an integer number (1950657092345).

Almost surely, 2^{21606604650054} is an apocalyptic number.

21606604650054 is an abundant number, since it is smaller than the sum of its proper divisors (25209165566226).

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

21606604650054 is a wasteful number, since it uses less digits than its factorization.

21606604650054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37439524 (or 37439521 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 21606604650054 in words is "twenty-one trillion, six hundred six billion, six hundred four million, six hundred fifty thousand, fifty-four".