212135455 has 12 divisors (see below), whose sum is σ = 296124120. Its totient is φ = 145464144.

The previous prime is 212135453. The next prime is 212135459. The reversal of 212135455 is 554531212.

It is not a de Polignac number, because 212135455 - 2¹ = 212135453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212135453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432685 + ... + 433174.

It is an arithmetic number, because the mean of its divisors is an integer number (24677010).

Almost surely, 2^212135455 is an apocalyptic number.

212135455 is a deficient number, since it is larger than the sum of its proper divisors (83988665).

212135455 is an equidigital number, since it uses as much as digits as its factorization.

212135455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865878 (or 865871 counting only the distinct ones).

The product of its digits is 6000, while the sum is 28.

The square root of 212135455 is about 14564.8705795829. The cubic root of 212135455 is about 596.4001627396.

Adding to 212135455 its reverse (554531212), we get a palindrome (766666667).

The spelling of 212135455 in words is "two hundred twelve million, one hundred thirty-five thousand, four hundred fifty-five".