21261302105106 has 24 divisors (see below), whose sum is σ = 49465070204400. Its totient is φ = 6074657744232.

The previous prime is 21261302105041. The next prime is 21261302105123. The reversal of 21261302105106 is 60150120316212.

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, 36158676756 + ... + 36158677343.

It is an arithmetic number, because the mean of its divisors is an integer number (2061044591850).

Almost surely, 2^{21261302105106} is an apocalyptic number.

21261302105106 is an abundant number, since it is smaller than the sum of its proper divisors (28203768099294).

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

21261302105106 is a wasteful number, since it uses less digits than its factorization.

21261302105106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72317354118 (or 72317354111 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 21261302105106 in words is "twenty-one trillion, two hundred sixty-one billion, three hundred two million, one hundred five thousand, one hundred six".