22021212220221 has 32 divisors (see below), whose sum is σ = 29725787237760. Its totient is φ = 14499112320000.

The previous prime is 22021212220207. The next prime is 22021212220277. The reversal of 22021212220221 is 12202221212022.

It is not a de Polignac number, because 22021212220221 - 2²⁷ = 22021078002493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021212230221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1048568721 + ... + 1048589721.

It is an arithmetic number, because the mean of its divisors is an integer number (928930851180).

Almost surely, 2^{22021212220221} is an apocalyptic number.

It is an amenable number.

22021212220221 is a deficient number, since it is larger than the sum of its proper divisors (7704575017539).

22021212220221 is a wasteful number, since it uses less digits than its factorization.

22021212220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25437.

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

Adding to 22021212220221 its reverse (12202221212022), we get a palindrome (34223433432243).

The spelling of 22021212220221 in words is "twenty-two trillion, twenty-one billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty-one".