222221010121221 has 16 divisors (see below), whose sum is σ = 311889551984640. Its totient is φ = 140349924918000.

The previous prime is 222221010121207. The next prime is 222221010121237. The reversal of 222221010121221 is 122121010122222.

222221010121221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 222221010121221 - 2⁷ = 222221010121093 is a prime.

It is a super-2 number, since 2×222221010121221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221010101221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49840846 + ... + 54116096.

It is an arithmetic number, because the mean of its divisors is an integer number (19493096999040).

Almost surely, 2^{222221010121221} is an apocalyptic number.

It is an amenable number.

222221010121221 is a deficient number, since it is larger than the sum of its proper divisors (89668541863419).

222221010121221 is a wasteful number, since it uses less digits than its factorization.

222221010121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5187176.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 222221010121221 its reverse (122121010122222), we get a palindrome (344342020243443).

The spelling of 222221010121221 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, ten million, one hundred twenty-one thousand, two hundred twenty-one".