212433391 has 4 divisors (see below), whose sum is σ = 218174872. Its totient is φ = 206691912.

The previous prime is 212433383. The next prime is 212433407. The reversal of 212433391 is 193334212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212433391 - 2³ = 212433383 is a prime.

It is a super-2 number, since 2×212433391² = 90255891223517762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212433301) 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, 2870685 + ... + 2870758.

It is an arithmetic number, because the mean of its divisors is an integer number (54543718).

Almost surely, 2^212433391 is an apocalyptic number.

212433391 is a deficient number, since it is larger than the sum of its proper divisors (5741481).

212433391 is an equidigital number, since it uses as much as digits as its factorization.

212433391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5741480.

The product of its digits is 3888, while the sum is 28.

The square root of 212433391 is about 14575.0948881988. The cubic root of 212433391 is about 596.6792390777.

The spelling of 212433391 in words is "two hundred twelve million, four hundred thirty-three thousand, three hundred ninety-one".