21106307666038 has 64 divisors (see below), whose sum is σ = 37631211724800. Its totient is φ = 8686686072960.

The previous prime is 21106307666021. The next prime is 21106307666071. The reversal of 21106307666038 is 83066670360112.

It is a junction number, because it is equal to n+sod(n) for n = 21106307665982 and 21106307666000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 719379573 + ... + 719408911.

It is an arithmetic number, because the mean of its divisors is an integer number (587987683200).

Almost surely, 2^{21106307666038} is an apocalyptic number.

21106307666038 is a deficient number, since it is larger than the sum of its proper divisors (16524904058762).

21106307666038 is a wasteful number, since it uses less digits than its factorization.

21106307666038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38845.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 21106307666038 in words is "twenty-one trillion, one hundred six billion, three hundred seven million, six hundred sixty-six thousand, thirty-eight".