21222232200 has 384 divisors, whose sum is σ = 83357164800. Its totient is φ = 4916367360.

The previous prime is 21222232177. The next prime is 21222232231. The reversal of 21222232200 is 223222212.

21222232200 is a `hidden beast` number, since 212 + 22 + 232 + 200 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1184509 + ... + 1202291.

It is an arithmetic number, because the mean of its divisors is an integer number (217075950).

Almost surely, 2^21222232200 is an apocalyptic number.

21222232200 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 21222232200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41678582400).

21222232200 is an abundant number, since it is smaller than the sum of its proper divisors (62134932600).

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

21222232200 is a wasteful number, since it uses less digits than its factorization.

21222232200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17838 (or 17823 counting only the distinct ones).

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

Adding to 21222232200 its reverse (223222212), we get a palindrome (21445454412).

It can be divided in two parts, 2122 and 2232200, that added together give a palindrome (2234322).

The spelling of 21222232200 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-two thousand, two hundred".