21839856284 has 6 divisors (see below), whose sum is σ = 38219748504. Its totient is φ = 10919928140.

The previous prime is 21839856277. The next prime is 21839856289. The reversal of 21839856284 is 48265893812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21839856289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2729982032 + ... + 2729982039.

It is an arithmetic number, because the mean of its divisors is an integer number (6369958084).

Almost surely, 2^21839856284 is an apocalyptic number.

It is an amenable number.

21839856284 is a deficient number, since it is larger than the sum of its proper divisors (16379892220).

21839856284 is a wasteful number, since it uses less digits than its factorization.

21839856284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5459964075 (or 5459964073 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 56.

The spelling of 21839856284 in words is "twenty-one billion, eight hundred thirty-nine million, eight hundred fifty-six thousand, two hundred eighty-four".