213881111 has 4 divisors (see below), whose sum is σ = 215117592. Its totient is φ = 212644632.

The previous prime is 213881099. The next prime is 213881137. The reversal of 213881111 is 111188312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213881111 - 2⁶ = 213881047 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 (213881141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617981 + ... + 618326.

It is an arithmetic number, because the mean of its divisors is an integer number (53779398).

Almost surely, 2^213881111 is an apocalyptic number.

213881111 is a deficient number, since it is larger than the sum of its proper divisors (1236481).

213881111 is a wasteful number, since it uses less digits than its factorization.

213881111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236480.

The product of its digits is 384, while the sum is 26.

The square root of 213881111 is about 14624.6747314257. The cubic root of 213881111 is about 598.0316152381.

The spelling of 213881111 in words is "two hundred thirteen million, eight hundred eighty-one thousand, one hundred eleven".