212222212121 has 8 divisors (see below), whose sum is σ = 214704160704. Its totient is φ = 209747729200.

The previous prime is 212222212073. The next prime is 212222212127. The reversal of 212222212121 is 121212222212.

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 212222212121 - 2²⁶ = 212155103257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212222212093 and 212222212102.

It is not an unprimeable number, because it can be changed into a prime (212222212127) 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, 1809221 + ... + 1922946.

It is an arithmetic number, because the mean of its divisors is an integer number (26838020088).

Almost surely, 2^212222212121 is an apocalyptic number.

It is an amenable number.

212222212121 is a deficient number, since it is larger than the sum of its proper divisors (2481948583).

212222212121 is a wasteful number, since it uses less digits than its factorization.

212222212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732831.

The product of its digits is 256, while the sum is 20.

Adding to 212222212121 its reverse (121212222212), we get a palindrome (333434434333).

It can be divided in two parts, 212222212 and 121, that multiplied together give a palindrome (25678887652).

The spelling of 212222212121 in words is "two hundred twelve billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".