21500111711 has 16 divisors (see below), whose sum is σ = 23274940416. Its totient is φ = 19742701536.

The previous prime is 21500111681. The next prime is 21500111719. The reversal of 21500111711 is 11711100512.

It is a cyclic number.

It is not a de Polignac number, because 21500111711 - 2³⁴ = 4320242527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500111719) 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, 7254716 + ... + 7257678.

It is an arithmetic number, because the mean of its divisors is an integer number (1454683776).

Almost surely, 2^21500111711 is an apocalyptic number.

21500111711 is a deficient number, since it is larger than the sum of its proper divisors (1774828705).

21500111711 is a wasteful number, since it uses less digits than its factorization.

21500111711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5702.

The product of its (nonzero) digits is 70, while the sum is 20.

The spelling of 21500111711 in words is "twenty-one billion, five hundred million, one hundred eleven thousand, seven hundred eleven".