21274986854 has 16 divisors (see below), whose sum is σ = 34816130640. Its totient is φ = 9669749760.

The previous prime is 21274986853. The next prime is 21274986881. The reversal of 21274986854 is 45868947212.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21274986854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21274986853) 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, 392762 + ... + 443634.

It is an arithmetic number, because the mean of its divisors is an integer number (2176008165).

Almost surely, 2^21274986854 is an apocalyptic number.

21274986854 is a deficient number, since it is larger than the sum of its proper divisors (13541143786).

21274986854 is a wasteful number, since it uses less digits than its factorization.

21274986854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69895.

The product of its digits is 7741440, while the sum is 56.

The spelling of 21274986854 in words is "twenty-one billion, two hundred seventy-four million, nine hundred eighty-six thousand, eight hundred fifty-four".