212264381 has 4 divisors (see below), whose sum is σ = 242587872. Its totient is φ = 181940892.

The previous prime is 212264341. The next prime is 212264399. The reversal of 212264381 is 183462212.

It is a happy number.

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 not a de Polignac number, because 212264381 - 2⁶ = 212264317 is a prime.

It is a super-2 number, since 2×212264381² = 90112334882626322, 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 (212264341) 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, 15161735 + ... + 15161748.

It is an arithmetic number, because the mean of its divisors is an integer number (60646968).

Almost surely, 2^212264381 is an apocalyptic number.

It is an amenable number.

212264381 is a deficient number, since it is larger than the sum of its proper divisors (30323491).

212264381 is an equidigital number, since it uses as much as digits as its factorization.

212264381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30323490.

The product of its digits is 4608, while the sum is 29.

The square root of 212264381 is about 14569.2958306158. The cubic root of 212264381 is about 596.5209596389.

The spelling of 212264381 in words is "two hundred twelve million, two hundred sixty-four thousand, three hundred eighty-one".