222100121221 has 16 divisors (see below), whose sum is σ = 256569664320. Its totient is φ = 190012775680.

The previous prime is 222100121203. The next prime is 222100121231. The reversal of 222100121221 is 122121001222.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 222100121221 - 2⁹ = 222100120709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222100121195 and 222100121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222100121231) 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, 1952895 + ... + 2063491.

It is an arithmetic number, because the mean of its divisors is an integer number (16035604020).

Almost surely, 2^222100121221 is an apocalyptic number.

It is an amenable number.

222100121221 is a deficient number, since it is larger than the sum of its proper divisors (34469543099).

222100121221 is a wasteful number, since it uses less digits than its factorization.

222100121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121364.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 222100121221 its reverse (122121001222), we get a palindrome (344221122443).

The spelling of 222100121221 in words is "two hundred twenty-two billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".