21854363832 has 48 divisors (see below), whose sum is σ = 67644461040. Its totient is φ = 6244103808.

The previous prime is 21854363819. The next prime is 21854363833. The reversal of 21854363832 is 23836345812.

21854363832 is a `hidden beast` number, since 2 + 1 + 8 + 5 + 4 + 3 + 638 + 3 + 2 = 666.

It is a super-2 number, since 2×21854363832² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21854363833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21680413 + ... + 21681420.

It is an arithmetic number, because the mean of its divisors is an integer number (1409259605).

Almost surely, 2^21854363832 is an apocalyptic number.

It is an amenable number.

21854363832 is an abundant number, since it is smaller than the sum of its proper divisors (45790097208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21854363832 is a wasteful number, since it uses less digits than its factorization.

21854363832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43361852 (or 43361845 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The spelling of 21854363832 in words is "twenty-one billion, eight hundred fifty-four million, three hundred sixty-three thousand, eight hundred thirty-two".