222212121221021 has 16 divisors (see below), whose sum is σ = 235884586408320. Its totient is φ = 208880117392320.

The previous prime is 222212121221017. The next prime is 222212121221039. The reversal of 222212121221021 is 120122121212222.

It is a cyclic number.

It is not a de Polignac number, because 222212121221021 - 2² = 222212121221017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222212121221621) 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, 68942486 + ... + 72093623.

It is an arithmetic number, because the mean of its divisors is an integer number (14742786650520).

Almost surely, 2^{222212121221021} is an apocalyptic number.

It is an amenable number.

222212121221021 is a deficient number, since it is larger than the sum of its proper divisors (13672465187299).

222212121221021 is a wasteful number, since it uses less digits than its factorization.

222212121221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141037316.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 222212121221021 its reverse (120122121212222), we get a palindrome (342334242433243).

The spelling of 222212121221021 in words is "two hundred twenty-two trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty-one".