21000322222200 has 72 divisors (see below), whose sum is σ = 70526082135600. Its totient is φ = 5600085925440.

The previous prime is 21000322222177. The next prime is 21000322222237. The reversal of 21000322222200 is 222222300012.

21000322222200 is a `hidden beast` number, since 2 + 100 + 0 + 322 + 22 + 220 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5833421040 + ... + 5833424639.

It is an arithmetic number, because the mean of its divisors is an integer number (979528918550).

Almost surely, 2^{21000322222200} is an apocalyptic number.

21000322222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000322222200 is an abundant number, since it is smaller than the sum of its proper divisors (49525759913400).

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

21000322222200 is a wasteful number, since it uses less digits than its factorization.

21000322222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11666845701 (or 11666845689 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21000322222200 its reverse (222222300012), we get a palindrome (21222544522212).

The spelling of 21000322222200 in words is "twenty-one trillion, three hundred twenty-two million, two hundred twenty-two thousand, two hundred".