21106603705 has 16 divisors (see below), whose sum is σ = 27664675200. Its totient is φ = 15331250560.

The previous prime is 21106603669. The next prime is 21106603747. The reversal of 21106603705 is 50730660112.

It is not a de Polignac number, because 21106603705 - 2⁷ = 21106603577 is a prime.

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, 192685 + ... + 281674.

It is an arithmetic number, because the mean of its divisors is an integer number (1729042200).

Almost surely, 2^21106603705 is an apocalyptic number.

It is an amenable number.

21106603705 is a deficient number, since it is larger than the sum of its proper divisors (6558071495).

21106603705 is a wasteful number, since it uses less digits than its factorization.

21106603705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475184.

The product of its (nonzero) digits is 7560, while the sum is 31.

The spelling of 21106603705 in words is "twenty-one billion, one hundred six million, six hundred three thousand, seven hundred five".