212345121 has 16 divisors (see below), whose sum is σ = 298728000. Its totient is φ = 133797888.

The previous prime is 212345093. The next prime is 212345123. The reversal of 212345121 is 121543212.

It is not a de Polignac number, because 212345121 - 2⁶ = 212345057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212345123) 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, 21445 + ... + 29741.

It is an arithmetic number, because the mean of its divisors is an integer number (18670500).

Almost surely, 2^212345121 is an apocalyptic number.

It is an amenable number.

212345121 is a deficient number, since it is larger than the sum of its proper divisors (86382879).

212345121 is a wasteful number, since it uses less digits than its factorization.

212345121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8768.

The product of its digits is 480, while the sum is 21.

The square root of 212345121 is about 14572.0664629283. The cubic root of 212345121 is about 596.5965838780.

Adding to 212345121 its reverse (121543212), we get a palindrome (333888333).

The spelling of 212345121 in words is "two hundred twelve million, three hundred forty-five thousand, one hundred twenty-one".