222222121202221 has 4 divisors (see below), whose sum is σ = 253968138516832. Its totient is φ = 190476103887612.

The previous prime is 222222121202203. The next prime is 222222121202317. The reversal of 222222121202221 is 122202121222222.

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 222222121202221 - 2⁷ = 222222121202093 is a prime.

It is a super-2 number, since 2×222222121202221² (a number of 29 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 (222222121202201) 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, 15873008657295 + ... + 15873008657308.

It is an arithmetic number, because the mean of its divisors is an integer number (63492034629208).

Almost surely, 2^{222222121202221} is an apocalyptic number.

It is an amenable number.

222222121202221 is a deficient number, since it is larger than the sum of its proper divisors (31746017314611).

222222121202221 is an equidigital number, since it uses as much as digits as its factorization.

222222121202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31746017314610.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 222222121202221 its reverse (122202121222222), we get a palindrome (344424242424443).

The spelling of 222222121202221 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".