21706552111 has 16 divisors (see below), whose sum is σ = 22376217600. Its totient is φ = 21047483808.

The previous prime is 21706552099. The next prime is 21706552159. The reversal of 21706552111 is 11125560712.

It is not a de Polignac number, because 21706552111 - 2⁵ = 21706552079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706552211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2485210 + ... + 2493928.

It is an arithmetic number, because the mean of its divisors is an integer number (1398513600).

Almost surely, 2^21706552111 is an apocalyptic number.

21706552111 is a deficient number, since it is larger than the sum of its proper divisors (669665489).

21706552111 is a wasteful number, since it uses less digits than its factorization.

21706552111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9318.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 21706552111 in words is "twenty-one billion, seven hundred six million, five hundred fifty-two thousand, one hundred eleven".