213345891 has 12 divisors (see below), whose sum is σ = 336181560. Its totient is φ = 129300480.

The previous prime is 213345877. The next prime is 213345893. The reversal of 213345891 is 198543312.

It is not a de Polignac number, because 213345891 - 2¹³ = 213337699 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (213345893) 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, 1077406 + ... + 1077603.

It is an arithmetic number, because the mean of its divisors is an integer number (28015130).

Almost surely, 2^213345891 is an apocalyptic number.

213345891 is a deficient number, since it is larger than the sum of its proper divisors (122835669).

213345891 is a wasteful number, since it uses less digits than its factorization.

213345891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155026 (or 2155023 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 213345891 is about 14606.3647428099. The cubic root of 213345891 is about 597.5323568082.

It can be divided in two parts, 21334 and 5891, that added together give a square (27225 = 165²).

The spelling of 213345891 in words is "two hundred thirteen million, three hundred forty-five thousand, eight hundred ninety-one".