212131451 has 4 divisors (see below), whose sum is σ = 242435952. Its totient is φ = 181826952.

The previous prime is 212131421. The next prime is 212131453. The reversal of 212131451 is 154131212.

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 212131451 - 2²⁶ = 145022587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212131453) 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, 15152240 + ... + 15152253.

It is an arithmetic number, because the mean of its divisors is an integer number (60608988).

Almost surely, 2^212131451 is an apocalyptic number.

212131451 is a deficient number, since it is larger than the sum of its proper divisors (30304501).

212131451 is an equidigital number, since it uses as much as digits as its factorization.

212131451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30304500.

The product of its digits is 240, while the sum is 20.

The square root of 212131451 is about 14564.7331249151. The cubic root of 212131451 is about 596.3964104181.

Adding to 212131451 its reverse (154131212), we get a palindrome (366262663).

The spelling of 212131451 in words is "two hundred twelve million, one hundred thirty-one thousand, four hundred fifty-one".