21201022221222 has 16 divisors (see below), whose sum is σ = 42402188803392. Its totient is φ = 7066983346920.

The previous prime is 21201022221221. The next prime is 21201022221233. The reversal of 21201022221222 is 22212222010212.

It is a super-3 number, since 3×21201022221222³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201022221221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4056804 + ... + 7672007.

It is an arithmetic number, because the mean of its divisors is an integer number (2650136800212).

Almost surely, 2^{21201022221222} is an apocalyptic number.

21201022221222 is an abundant number, since it is smaller than the sum of its proper divisors (21201166582170).

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

21201022221222 is a wasteful number, since it uses less digits than its factorization.

21201022221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12030083.

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

Adding to 21201022221222 its reverse (22212222010212), we get a palindrome (43413244231434).

The spelling of 21201022221222 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-two".