21505083115606 has 32 divisors (see below), whose sum is σ = 34472179501056. Its totient is φ = 10039782060000.

The previous prime is 21505083115541. The next prime is 21505083115619. The reversal of 21505083115606 is 60651138050512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32266830 + ... + 32926561.

It is an arithmetic number, because the mean of its divisors is an integer number (1077255609408).

Almost surely, 2^{21505083115606} is an apocalyptic number.

21505083115606 is a deficient number, since it is larger than the sum of its proper divisors (12967096385450).

21505083115606 is a wasteful number, since it uses less digits than its factorization.

21505083115606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65193588.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 21505083115606 in words is "twenty-one trillion, five hundred five billion, eighty-three million, one hundred fifteen thousand, six hundred six".