212231453 has 4 divisors (see below), whose sum is σ = 242550240. Its totient is φ = 181912668.

The previous prime is 212231431. The next prime is 212231471. The reversal of 212231453 is 354132212.

212231453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212231453 - 2¹⁰ = 212230429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212231423) 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, 15159383 + ... + 15159396.

It is an arithmetic number, because the mean of its divisors is an integer number (60637560).

Almost surely, 2^212231453 is an apocalyptic number.

It is an amenable number.

212231453 is a deficient number, since it is larger than the sum of its proper divisors (30318787).

212231453 is an equidigital number, since it uses as much as digits as its factorization.

212231453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30318786.

The product of its digits is 1440, while the sum is 23.

The square root of 212231453 is about 14568.1657390352. The cubic root of 212231453 is about 596.4901124821.

Adding to 212231453 its reverse (354132212), we get a palindrome (566363665).

The spelling of 212231453 in words is "two hundred twelve million, two hundred thirty-one thousand, four hundred fifty-three".