21800731000 has 128 divisors (see below), whose sum is σ = 51578429760. Its totient is φ = 8624448000.

The previous prime is 21800730983. The next prime is 21800731003. The reversal of 21800731000 is 13700812.

It is a super-2 number, since 2×21800731000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21800731003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58446814 + ... + 58447186.

Almost surely, 2^21800731000 is an apocalyptic number.

21800731000 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 21800731000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25789214880).

21800731000 is an abundant number, since it is smaller than the sum of its proper divisors (29777698760).

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

21800731000 is a wasteful number, since it uses less digits than its factorization.

21800731000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The spelling of 21800731000 in words is "twenty-one billion, eight hundred million, seven hundred thirty-one thousand".