212642455 has 4 divisors (see below), whose sum is σ = 255170952. Its totient is φ = 170113960.

The previous prime is 212642453. The next prime is 212642459. The reversal of 212642455 is 554246212.

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

It is not a de Polignac number, because 212642455 - 2¹ = 212642453 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 (212642453) 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, 21264241 + ... + 21264250.

It is an arithmetic number, because the mean of its divisors is an integer number (63792738).

Almost surely, 2^212642455 is an apocalyptic number.

212642455 is a deficient number, since it is larger than the sum of its proper divisors (42528497).

212642455 is an equidigital number, since it uses as much as digits as its factorization.

212642455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42528496.

The product of its digits is 19200, while the sum is 31.

The square root of 212642455 is about 14582.2650846842. The cubic root of 212642455 is about 596.8749133521.

Adding to 212642455 its reverse (554246212), we get a palindrome (766888667).

The spelling of 212642455 in words is "two hundred twelve million, six hundred forty-two thousand, four hundred fifty-five".