21161055711 has 8 divisors (see below), whose sum is σ = 29874431664. Its totient is φ = 13277525120.

The previous prime is 21161055701. The next prime is 21161055739. The reversal of 21161055711 is 11755016112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21161055711 - 2⁶ = 21161055647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161055701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207461280 + ... + 207461381.

It is an arithmetic number, because the mean of its divisors is an integer number (3734303958).

Almost surely, 2^21161055711 is an apocalyptic number.

21161055711 is a deficient number, since it is larger than the sum of its proper divisors (8713375953).

21161055711 is a wasteful number, since it uses less digits than its factorization.

21161055711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414922681.

The product of its (nonzero) digits is 2100, while the sum is 30.

The spelling of 21161055711 in words is "twenty-one billion, one hundred sixty-one million, fifty-five thousand, seven hundred eleven".