21222122200002 has 56 divisors (see below), whose sum is σ = 47821711221180. Its totient is φ = 7060142567520.

The previous prime is 21222122199961. The next prime is 21222122200009. The reversal of 21222122200002 is 20000222122212.

It can be written as a sum of positive squares in 2 ways, for example, as 20937680244441 + 284441955561 = 4575771^2 + 533331^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21222122200009) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 13556149 + ... + 15040392.

Almost surely, 2^{21222122200002} is an apocalyptic number.

21222122200002 is an abundant number, since it is smaller than the sum of its proper divisors (26599589021178).

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

21222122200002 is an equidigital number, since it uses as much as digits as its factorization.

21222122200002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28597070 (or 28597055 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222122200002 its reverse (20000222122212), we get a palindrome (41222344322214).

The spelling of 21222122200002 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, two hundred thousand, two".