212012121 has 16 divisors (see below), whose sum is σ = 285143040. Its totient is φ = 140117520.

The previous prime is 212012077. The next prime is 212012123. The reversal of 212012121 is 121210212.

It is not a de Polignac number, because 212012121 - 2⁶ = 212012057 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212012097 and 212012106.

It is not an unprimeable number, because it can be changed into a prime (212012123) 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, 207550 + ... + 208568.

It is an arithmetic number, because the mean of its divisors is an integer number (17821440).

Almost surely, 2^212012121 is an apocalyptic number.

It is an amenable number.

212012121 is a deficient number, since it is larger than the sum of its proper divisors (73130919).

212012121 is a wasteful number, since it uses less digits than its factorization.

212012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 212012121 is about 14560.6360094606. The cubic root of 212012121 is about 596.2845594374.

Adding to 212012121 its reverse (121210212), we get a palindrome (333222333).

It can be divided in two parts, 2120 and 12121, that added together give a palindrome (14241).

The spelling of 212012121 in words is "two hundred twelve million, twelve thousand, one hundred twenty-one".