21811054311867 has 16 divisors (see below), whose sum is σ = 30585921573888. Its totient is φ = 13806145148640.

The previous prime is 21811054311833. The next prime is 21811054311877. The reversal of 21811054311867 is 76811345011812.

It is not a de Polignac number, because 21811054311867 - 2¹⁸ = 21811054049723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21811054311817) 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, 2212518333 + ... + 2212528190.

It is an arithmetic number, because the mean of its divisors is an integer number (1911620098368).

Almost surely, 2^{21811054311867} is an apocalyptic number.

21811054311867 is a deficient number, since it is larger than the sum of its proper divisors (8774867262021).

21811054311867 is a wasteful number, since it uses less digits than its factorization.

21811054311867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4425046610.

The product of its (nonzero) digits is 322560, while the sum is 48.

The spelling of 21811054311867 in words is "twenty-one trillion, eight hundred eleven billion, fifty-four million, three hundred eleven thousand, eight hundred sixty-seven".