213120391 has 8 divisors (see below), whose sum is σ = 240512400. Its totient is φ = 187064640.

The previous prime is 213120371. The next prime is 213120409. The reversal of 213120391 is 193021312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213120391 - 2¹⁷ = 212989319 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 (213120371) 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 7 ways as a sum of consecutive naturals, for example, 333726 + ... + 334363.

It is an arithmetic number, because the mean of its divisors is an integer number (30064050).

Almost surely, 2^213120391 is an apocalyptic number.

213120391 is a deficient number, since it is larger than the sum of its proper divisors (27392009).

213120391 is a wasteful number, since it uses less digits than its factorization.

213120391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668129.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 213120391 is about 14598.6434643771. The cubic root of 213120391 is about 597.3217581930.

It can be divided in two parts, 2131 and 20391, that added together give a palindrome (22522).

The spelling of 213120391 in words is "two hundred thirteen million, one hundred twenty thousand, three hundred ninety-one".