21986244854 has 16 divisors (see below), whose sum is σ = 37702903200. Its totient is φ = 9419626944.

The previous prime is 21986244853. The next prime is 21986244859. The reversal of 21986244854 is 45844268912.

It is a junction number, because it is equal to n+sod(n) for n = 21986244796 and 21986244805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21986244853) 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, 209039 + ... + 296090.

It is an arithmetic number, because the mean of its divisors is an integer number (2356431450).

Almost surely, 2^21986244854 is an apocalyptic number.

21986244854 is a deficient number, since it is larger than the sum of its proper divisors (15716658346).

21986244854 is a wasteful number, since it uses less digits than its factorization.

21986244854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508247.

The product of its digits is 4423680, while the sum is 53.

The spelling of 21986244854 in words is "twenty-one billion, nine hundred eighty-six million, two hundred forty-four thousand, eight hundred fifty-four".