21150355300 has 72 divisors (see below), whose sum is σ = 46436862920. Its totient is φ = 8360755200.

The previous prime is 21150355277. The next prime is 21150355301. The reversal of 21150355300 is 355305112.

It can be written as a sum of positive squares in 12 ways, for example, as 6646488676 + 14503866624 = 81526^2 + 120432^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21150355301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9786220 + ... + 9788380.

Almost surely, 2^21150355300 is an apocalyptic number.

21150355300 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 21150355300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23218431460).

21150355300 is an abundant number, since it is smaller than the sum of its proper divisors (25286507620).

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

21150355300 is a wasteful number, since it uses less digits than its factorization.

21150355300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281 (or 3274 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 25.

The spelling of 21150355300 in words is "twenty-one billion, one hundred fifty million, three hundred fifty-five thousand, three hundred".