212222212112221 has 16 divisors (see below), whose sum is σ = 225294701670000. Its totient is φ = 199215497248768.

The previous prime is 212222212112203. The next prime is 212222212112233. The reversal of 212222212112221 is 122211212222212.

It can be written as a sum of positive squares in 8 ways, for example, as 11995042584996 + 200227169527225 = 3463386^2 + 14150165^2 .

It is a cyclic number.

It is not a de Polignac number, because 212222212112221 - 2⁴⁵ = 177037840023389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222212152221) 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, 14002761 + ... + 24910273.

It is an arithmetic number, because the mean of its divisors is an integer number (14080918854375).

Almost surely, 2^{212222212112221} is an apocalyptic number.

It is an amenable number.

212222212112221 is a deficient number, since it is larger than the sum of its proper divisors (13072489557779).

212222212112221 is a wasteful number, since it uses less digits than its factorization.

212222212112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10910528.

The product of its digits is 1024, while the sum is 25.

Adding to 212222212112221 its reverse (122211212222212), we get a palindrome (334433424334433).

The spelling of 212222212112221 in words is "two hundred twelve trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty-one".