21706054253611 has 16 divisors (see below), whose sum is σ = 26754604841664. Its totient is φ = 17148653069184.

The previous prime is 21706054253479. The next prime is 21706054253621. The reversal of 21706054253611 is 11635245060712.

It is not a de Polignac number, because 21706054253611 - 2⁹ = 21706054253099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21706054253621) 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, 176103880 + ... + 176227093.

It is an arithmetic number, because the mean of its divisors is an integer number (1672162802604).

Almost surely, 2^{21706054253611} is an apocalyptic number.

21706054253611 is a deficient number, since it is larger than the sum of its proper divisors (5048550588053).

21706054253611 is a wasteful number, since it uses less digits than its factorization.

21706054253611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352331670.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 21706054253611 in words is "twenty-one trillion, seven hundred six billion, fifty-four million, two hundred fifty-three thousand, six hundred eleven".