222121221210121 has 4 divisors (see below), whose sum is σ = 222123343809744. Its totient is φ = 222119098610500.

The previous prime is 222121221210023. The next prime is 222121221210139. The reversal of 222121221210121 is 121012122121222.

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 222121221210121 - 2³⁹ = 221571465396233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222121221210092 and 222121221210101.

It is not an unprimeable number, because it can be changed into a prime (222121221210221) 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, 1061142835 + ... + 1061352136.

It is an arithmetic number, because the mean of its divisors is an integer number (55530835952436).

Almost surely, 2^{222121221210121} is an apocalyptic number.

It is an amenable number.

222121221210121 is a deficient number, since it is larger than the sum of its proper divisors (2122599623).

222121221210121 is a wasteful number, since it uses less digits than its factorization.

222121221210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122599622.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 222121221210121 its reverse (121012122121222), we get a palindrome (343133343331343).

The spelling of 222121221210121 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".