21561190200 has 192 divisors, whose sum is σ = 81018028800. Its totient is φ = 5226940800.

The previous prime is 21561190171. The next prime is 21561190207. The reversal of 21561190200 is 209116512.

21561190200 is a `hidden beast` number, since 21 + 5 + 611 + 9 + 0 + 20 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21561190207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122092 + ... + 240891.

It is an arithmetic number, because the mean of its divisors is an integer number (421968900).

Almost surely, 2^21561190200 is an apocalyptic number.

21561190200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21561190200 is an abundant number, since it is smaller than the sum of its proper divisors (59456838600).

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

21561190200 is a wasteful number, since it uses less digits than its factorization.

21561190200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363019 (or 363004 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 21561190200 in words is "twenty-one billion, five hundred sixty-one million, one hundred ninety thousand, two hundred".