213261243 has 16 divisors (see below), whose sum is σ = 324235296. Its totient is φ = 123517440.

The previous prime is 213261227. The next prime is 213261253. The reversal of 213261243 is 342162312.

It is not a de Polignac number, because 213261243 - 2⁴ = 213261227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213261203) 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 15 ways as a sum of consecutive naturals, for example, 160168 + ... + 161493.

It is an arithmetic number, because the mean of its divisors is an integer number (20264706).

Almost surely, 2^213261243 is an apocalyptic number.

213261243 is a deficient number, since it is larger than the sum of its proper divisors (110974053).

213261243 is a wasteful number, since it uses less digits than its factorization.

213261243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321694.

The product of its digits is 1728, while the sum is 24.

The square root of 213261243 is about 14603.4668144246. The cubic root of 213261243 is about 597.4533198828.

The spelling of 213261243 in words is "two hundred thirteen million, two hundred sixty-one thousand, two hundred forty-three".