21201022122222 has 64 divisors (see below), whose sum is σ = 46032277584384. Its totient is φ = 6483294428160.

The previous prime is 21201022122211. The next prime is 21201022122289. The reversal of 21201022122222 is 22222122010212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2439223 + ... + 6953549.

It is an arithmetic number, because the mean of its divisors is an integer number (719254337256).

Almost surely, 2^{21201022122222} is an apocalyptic number.

21201022122222 is an abundant number, since it is smaller than the sum of its proper divisors (24831255462162).

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

21201022122222 is a wasteful number, since it uses less digits than its factorization.

21201022122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4515513.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21201022122222 its reverse (22222122010212), we get a palindrome (43423144132434).

The spelling of 21201022122222 in words is "twenty-one trillion, two hundred one billion, twenty-two million, one hundred twenty-two thousand, two hundred twenty-two".