21380156200 has 144 divisors (see below), whose sum is σ = 54015242580. Its totient is φ = 7866593280.

The previous prime is 21380156197. The next prime is 21380156263. The reversal of 21380156200 is 265108312.

It can be written as a sum of positive squares in 18 ways, for example, as 6589218276 + 14790937924 = 81174^2 + 121618^2 .

It is a super-2 number, since 2×21380156200² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11389662 + ... + 11391538.

Almost surely, 2^21380156200 is an apocalyptic number.

21380156200 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 21380156200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27007621290).

21380156200 is an abundant number, since it is smaller than the sum of its proper divisors (32635086380).

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

21380156200 is a wasteful number, since it uses less digits than its factorization.

21380156200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256 (or 2234 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 21380156200 in words is "twenty-one billion, three hundred eighty million, one hundred fifty-six thousand, two hundred".