213621255 has 24 divisors (see below), whose sum is σ = 371112768. Its totient is φ = 113674176.

The previous prime is 213621229. The next prime is 213621281. The reversal of 213621255 is 552126312.

It is a happy number.

213621255 is a `hidden beast` number, since 2 + 13 + 621 + 25 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (213621229) and next prime (213621281).

It is not a de Polignac number, because 213621255 - 2⁸ = 213620999 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15709 + ... + 25961.

It is an arithmetic number, because the mean of its divisors is an integer number (15463032).

Almost surely, 2^213621255 is an apocalyptic number.

213621255 is a deficient number, since it is larger than the sum of its proper divisors (157491513).

213621255 is a wasteful number, since it uses less digits than its factorization.

213621255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10727 (or 10724 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 213621255 is about 14615.7878679187. The cubic root of 213621255 is about 597.7893231835.

Adding to 213621255 its reverse (552126312), we get a palindrome (765747567).

The spelling of 213621255 in words is "two hundred thirteen million, six hundred twenty-one thousand, two hundred fifty-five".