21851248286 has 16 divisors (see below), whose sum is σ = 38471696736. Its totient is φ = 9111717216.

The previous prime is 21851248261. The next prime is 21851248313. The reversal of 21851248286 is 68284215812.

It is a self number, because there is not a number n which added to its sum of digits gives 21851248286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21091421 + ... + 21092456.

It is an arithmetic number, because the mean of its divisors is an integer number (2404481046).

Almost surely, 2^21851248286 is an apocalyptic number.

21851248286 is a deficient number, since it is larger than the sum of its proper divisors (16620448450).

21851248286 is a wasteful number, since it uses less digits than its factorization.

21851248286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42183923.

The product of its digits is 491520, while the sum is 47.

The spelling of 21851248286 in words is "twenty-one billion, eight hundred fifty-one million, two hundred forty-eight thousand, two hundred eighty-six".