212012222121 has 80 divisors (see below), whose sum is σ = 370474942464. Its totient is φ = 118309203936.

The previous prime is 212012222119. The next prime is 212012222143. The reversal of 212012222121 is 121222210212.

It is a happy number.

It is not a de Polignac number, because 212012222121 - 2¹ = 212012222119 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212012222094 and 212012222103.

It is not an unprimeable number, because it can be changed into a prime (212012222021) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12329896 + ... + 12347078.

Almost surely, 2^212012222121 is an apocalyptic number.

212012222121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212012222121 is a deficient number, since it is larger than the sum of its proper divisors (158462720343).

212012222121 is a wasteful number, since it uses less digits than its factorization.

212012222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17712 (or 17703 counting only the distinct ones).

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

Adding to 212012222121 its reverse (121222210212), we get a palindrome (333234432333).

The spelling of 212012222121 in words is "two hundred twelve billion, twelve million, two hundred twenty-two thousand, one hundred twenty-one".