212222201121021 has 32 divisors (see below), whose sum is σ = 357674562128128. Its totient is φ = 108915938081280.

The previous prime is 212222201121017. The next prime is 212222201121067. The reversal of 212222201121021 is 120121102222212.

It is not a de Polignac number, because 212222201121021 - 2² = 212222201121017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222201121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10504999360 + ... + 10505019561.

It is an arithmetic number, because the mean of its divisors is an integer number (11177330066504).

Almost surely, 2^{212222201121021} is an apocalyptic number.

212222201121021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212222201121021 is a deficient number, since it is larger than the sum of its proper divisors (145452361007107).

212222201121021 is a wasteful number, since it uses less digits than its factorization.

212222201121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21010018981.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212222201121021 its reverse (120121102222212), we get a palindrome (332343303343233).

The spelling of 212222201121021 in words is "two hundred twelve trillion, two hundred twenty-two billion, two hundred one million, one hundred twenty-one thousand, twenty-one".