212010121 has 4 divisors (see below), whose sum is σ = 213991632. Its totient is φ = 210028612.

The previous prime is 212010119. The next prime is 212010133. The reversal of 212010121 is 121010212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212010121 - 2¹ = 212010119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212010098 and 212010107.

It is not an unprimeable number, because it can be changed into a prime (212010101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990595 + ... + 990808.

It is an arithmetic number, because the mean of its divisors is an integer number (53497908).

Almost surely, 2^212010121 is an apocalyptic number.

It is an amenable number.

212010121 is a deficient number, since it is larger than the sum of its proper divisors (1981511).

212010121 is a wasteful number, since it uses less digits than its factorization.

212010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981510.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 212010121 is about 14560.5673309799. The cubic root of 212010121 is about 596.2826844300.

Adding to 212010121 its reverse (121010212), we get a palindrome (333020333).

Subtracting from 212010121 its reverse (121010212), we obtain a palindrome (90999909).

The spelling of 212010121 in words is "two hundred twelve million, ten thousand, one hundred twenty-one".