21854045812 has 6 divisors (see below), whose sum is σ = 38244580178. Its totient is φ = 10927022904.

The previous prime is 21854045749. The next prime is 21854045839.

21854045812 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 18724090896 + 3129954916 = 136836^2 + 55946^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2731755723 + ... + 2731755730.

Almost surely, 2^21854045812 is an apocalyptic number.

It is an amenable number.

21854045812 is a deficient number, since it is larger than the sum of its proper divisors (16390534366).

21854045812 is a wasteful number, since it uses less digits than its factorization.

21854045812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463511457 (or 5463511455 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 40.

The spelling of 21854045812 in words is "twenty-one billion, eight hundred fifty-four million, forty-five thousand, eight hundred twelve".