212222102121 has 12 divisors (see below), whose sum is σ = 307649693572. Its totient is φ = 140970636576.

The previous prime is 212222102101. The next prime is 212222102123. The reversal of 212222102121 is 121201222212.

It is a happy number.

212222102121 is a `hidden beast` number, since 21 + 222 + 210 + 212 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11607692121 + 200614410000 = 107739^2 + 447900^2 .

It is not a de Polignac number, because 212222102121 - 2¹⁴ = 212222085737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212222102094 and 212222102103.

It is not an unprimeable number, because it can be changed into a prime (212222102123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42561106 + ... + 42566091.

Almost surely, 2^212222102121 is an apocalyptic number.

It is an amenable number.

212222102121 is a deficient number, since it is larger than the sum of its proper divisors (95427591451).

212222102121 is a wasteful number, since it uses less digits than its factorization.

212222102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85127480 (or 85127477 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212222102121 its reverse (121201222212), we get a palindrome (333423324333).

The spelling of 212222102121 in words is "two hundred twelve billion, two hundred twenty-two million, one hundred two thousand, one hundred twenty-one".