21650115705 has 16 divisors (see below), whose sum is σ = 34783926144. Its totient is φ = 11498814720.

The previous prime is 21650115659. The next prime is 21650115737. The reversal of 21650115705 is 50751105612.

It is a happy number.

It is not a de Polignac number, because 21650115705 - 2⁸ = 21650115449 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, 2990869 + ... + 2998098.

It is an arithmetic number, because the mean of its divisors is an integer number (2173995384).

Almost surely, 2^21650115705 is an apocalyptic number.

It is an amenable number.

21650115705 is a deficient number, since it is larger than the sum of its proper divisors (13133810439).

21650115705 is a wasteful number, since it uses less digits than its factorization.

21650115705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5989216.

The product of its (nonzero) digits is 10500, while the sum is 33.

The spelling of 21650115705 in words is "twenty-one billion, six hundred fifty million, one hundred fifteen thousand, seven hundred five".