222121000121 has 4 divisors (see below), whose sum is σ = 222122711412. Its totient is φ = 222119288832.

The previous prime is 222121000109. The next prime is 222121000181. The reversal of 222121000121 is 121000121222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 176169075625 + 45951924496 = 419725^2 + 214364^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121000121 - 2³⁴ = 204941130937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222121000096 and 222121000105.

It is not an unprimeable number, because it can be changed into a prime (222121000181) 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, 643400 + ... + 926393.

It is an arithmetic number, because the mean of its divisors is an integer number (55530677853).

Almost surely, 2^222121000121 is an apocalyptic number.

It is an amenable number.

222121000121 is a deficient number, since it is larger than the sum of its proper divisors (1711291).

222121000121 is a wasteful number, since it uses less digits than its factorization.

222121000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711290.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 222121000121 its reverse (121000121222), we get a palindrome (343121121343).

It can be divided in two parts, 222 and 121000121, that multiplied together give a palindrome (26862026862).

The spelling of 222121000121 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.