21603622705 has 16 divisors (see below), whose sum is σ = 30583563264. Its totient is φ = 14336043840.

The previous prime is 21603622673. The next prime is 21603622727. The reversal of 21603622705 is 50722630612.

It is not a de Polignac number, because 21603622705 - 2⁵ = 21603622673 is a prime.

It is a Duffinian 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, 9954502 + ... + 9956671.

It is an arithmetic number, because the mean of its divisors is an integer number (1911472704).

Almost surely, 2^21603622705 is an apocalyptic number.

It is an amenable number.

21603622705 is a deficient number, since it is larger than the sum of its proper divisors (8979940559).

21603622705 is a wasteful number, since it uses less digits than its factorization.

21603622705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19911216.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 21603622705 in words is "twenty-one billion, six hundred three million, six hundred twenty-two thousand, seven hundred five".