21894256111 has 16 divisors (see below), whose sum is σ = 28365030400. Its totient is φ = 16411193568.

The previous prime is 21894256093. The next prime is 21894256147. The reversal of 21894256111 is 11165249812.

It is not a de Polignac number, because 21894256111 - 2¹⁹ = 21893731823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894254111) 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, 6329751 + ... + 6333208.

It is an arithmetic number, because the mean of its divisors is an integer number (1772814400).

Almost surely, 2^21894256111 is an apocalyptic number.

21894256111 is a deficient number, since it is larger than the sum of its proper divisors (6470774289).

21894256111 is a wasteful number, since it uses less digits than its factorization.

21894256111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12662998.

The product of its digits is 34560, while the sum is 40.

The spelling of 21894256111 in words is "twenty-one billion, eight hundred ninety-four million, two hundred fifty-six thousand, one hundred eleven".