212211221221121 has 8 divisors (see below), whose sum is σ = 213306503595840. Its totient is φ = 211118307025968.

The previous prime is 212211221221117. The next prime is 212211221221147. The reversal of 212211221221121 is 121122122112212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212211221221121 - 2² = 212211221221117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212211221223121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591865211 + ... + 592223648.

It is an arithmetic number, because the mean of its divisors is an integer number (26663312949480).

Almost surely, 2^{212211221221121} is an apocalyptic number.

It is an amenable number.

212211221221121 is a deficient number, since it is larger than the sum of its proper divisors (1095282374719).

212211221221121 is a wasteful number, since it uses less digits than its factorization.

212211221221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184089783.

The product of its digits is 256, while the sum is 23.

Adding to 212211221221121 its reverse (121122122112212), we get a palindrome (333333343333333).

The spelling of 212211221221121 in words is "two hundred twelve trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".