21881574000 has 480 divisors, whose sum is σ = 89796627648. Its totient is φ = 4896000000.

The previous prime is 21881573921. The next prime is 21881574023. The reversal of 21881574000 is 47518812.

21881574000 is a `hidden beast` number, since 2 + 1 + 8 + 81 + 574 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2569750 + ... + 2578250.

Almost surely, 2^21881574000 is an apocalyptic number.

21881574000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21881574000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44898313824).

21881574000 is an abundant number, since it is smaller than the sum of its proper divisors (67915053648).

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

21881574000 is a wasteful number, since it uses less digits than its factorization.

21881574000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8554 (or 8535 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The spelling of 21881574000 in words is "twenty-one billion, eight hundred eighty-one million, five hundred seventy-four thousand".