21000221022200 has 48 divisors (see below), whose sum is σ = 55800587291280. Its totient is φ = 7200075778560.

The previous prime is 21000221022191. The next prime is 21000221022223. The reversal of 21000221022200 is 222012200012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7500077537 + ... + 7500080336.

It is an arithmetic number, because the mean of its divisors is an integer number (1162512235235).

Almost surely, 2^{21000221022200} is an apocalyptic number.

21000221022200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000221022200 is an abundant number, since it is smaller than the sum of its proper divisors (34800366269080).

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

21000221022200 is a wasteful number, since it uses less digits than its factorization.

21000221022200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15000157896 (or 15000157887 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21000221022200 its reverse (222012200012), we get a palindrome (21222233222212).

The spelling of 21000221022200 in words is "twenty-one trillion, two hundred twenty-one million, twenty-two thousand, two hundred".