212210222121 has 24 divisors (see below), whose sum is σ = 323501368320. Its totient is φ = 133677526176.

The previous prime is 212210222101. The next prime is 212210222251. The reversal of 212210222121 is 121222012212.

It is a happy number.

212210222121 is a `hidden beast` number, since 212 + 210 + 2 + 221 + 21 = 666.

It is not a de Polignac number, because 212210222121 - 2²⁶ = 212143113257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212210222094 and 212210222103.

It is not an unprimeable number, because it can be changed into a prime (212210222101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1554606 + ... + 1685591.

It is an arithmetic number, because the mean of its divisors is an integer number (13479223680).

Almost surely, 2^212210222121 is an apocalyptic number.

It is an amenable number.

212210222121 is a deficient number, since it is larger than the sum of its proper divisors (111291146199).

212210222121 is a wasteful number, since it uses less digits than its factorization.

212210222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3240605 (or 3240602 counting only the distinct ones).

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

Adding to 212210222121 its reverse (121222012212), we get a palindrome (333432234333).

The spelling of 212210222121 in words is "two hundred twelve billion, two hundred ten million, two hundred twenty-two thousand, one hundred twenty-one".