21296791705 has 16 divisors (see below), whose sum is σ = 29996409600. Its totient is φ = 14208823872.

The previous prime is 21296791693. The next prime is 21296791717. The reversal of 21296791705 is 50719769212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21296791693) and next prime (21296791717).

It is a cyclic number.

It is not a de Polignac number, because 21296791705 - 2⁵ = 21296791673 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, 8221405 + ... + 8223994.

It is an arithmetic number, because the mean of its divisors is an integer number (1874775600).

Almost surely, 2^21296791705 is an apocalyptic number.

It is an amenable number.

21296791705 is a deficient number, since it is larger than the sum of its proper divisors (8699617895).

21296791705 is a wasteful number, since it uses less digits than its factorization.

21296791705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16445448.

The product of its (nonzero) digits is 476280, while the sum is 49.

The spelling of 21296791705 in words is "twenty-one billion, two hundred ninety-six million, seven hundred ninety-one thousand, seven hundred five".