212393813 has 4 divisors (see below), whose sum is σ = 217333248. Its totient is φ = 207454380.

The previous prime is 212393789. The next prime is 212393821. The reversal of 212393813 is 318393212.

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 212393813 - 2⁶ = 212393749 is a prime.

It is a super-2 number, since 2×212393813² = 90222263601357938, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212393813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212393513) 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, 2469653 + ... + 2469738.

It is an arithmetic number, because the mean of its divisors is an integer number (54333312).

Almost surely, 2^212393813 is an apocalyptic number.

It is an amenable number.

212393813 is a deficient number, since it is larger than the sum of its proper divisors (4939435).

212393813 is an equidigital number, since it uses as much as digits as its factorization.

212393813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939434.

The product of its digits is 7776, while the sum is 32.

The square root of 212393813 is about 14573.7370979444. The cubic root of 212393813 is about 596.6421814420.

It can be divided in two parts, 21239 and 3813, that added together give a palindrome (25052).

The spelling of 212393813 in words is "two hundred twelve million, three hundred ninety-three thousand, eight hundred thirteen".