212332421 has 4 divisors (see below), whose sum is σ = 242665632. Its totient is φ = 181999212.

The previous prime is 212332357. The next prime is 212332427. The reversal of 212332421 is 124233212.

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 212332421 - 2⁶ = 212332357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212332393 and 212332402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212332427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15166595 + ... + 15166608.

It is an arithmetic number, because the mean of its divisors is an integer number (60666408).

Almost surely, 2^212332421 is an apocalyptic number.

It is an amenable number.

212332421 is a deficient number, since it is larger than the sum of its proper divisors (30333211).

212332421 is an equidigital number, since it uses as much as digits as its factorization.

212332421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30333210.

The product of its digits is 576, while the sum is 20.

The square root of 212332421 is about 14571.6306911752. The cubic root of 212332421 is about 596.5846898324.

Adding to 212332421 its reverse (124233212), we get a palindrome (336565633).

The spelling of 212332421 in words is "two hundred twelve million, three hundred thirty-two thousand, four hundred twenty-one".