222122021221 has 4 divisors (see below), whose sum is σ = 229287247744. Its totient is φ = 214956794700.

The previous prime is 222122021201. The next prime is 222122021257. The reversal of 222122021221 is 122120221222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222122021221 - 2²⁹ = 221585150309 is a prime.

It is a super-2 number, since 2×222122021221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222122021201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3582613215 + ... + 3582613276.

It is an arithmetic number, because the mean of its divisors is an integer number (57321811936).

Almost surely, 2^222122021221 is an apocalyptic number.

It is an amenable number.

222122021221 is a deficient number, since it is larger than the sum of its proper divisors (7165226523).

222122021221 is an equidigital number, since it uses as much as digits as its factorization.

222122021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7165226522.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 222122021221 its reverse (122120221222), we get a palindrome (344242242443).

The spelling of 222122021221 in words is "two hundred twenty-two billion, one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".