212403121 has 4 divisors (see below), whose sum is σ = 242746432. Its totient is φ = 182059812.

The previous prime is 212403119. The next prime is 212403157. The reversal of 212403121 is 121304212.

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 212403121 - 2¹ = 212403119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212403095 and 212403104.

It is not an unprimeable number, because it can be changed into a prime (212403161) 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, 15171645 + ... + 15171658.

It is an arithmetic number, because the mean of its divisors is an integer number (60686608).

Almost surely, 2^212403121 is an apocalyptic number.

It is an amenable number.

212403121 is a deficient number, since it is larger than the sum of its proper divisors (30343311).

212403121 is an equidigital number, since it uses as much as digits as its factorization.

212403121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30343310.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 212403121 is about 14574.0564360098. The cubic root of 212403121 is about 596.6508971138.

Adding to 212403121 its reverse (121304212), we get a palindrome (333707333).

The spelling of 212403121 in words is "two hundred twelve million, four hundred three thousand, one hundred twenty-one".