213401905 has 16 divisors (see below), whose sum is σ = 263197440. Its totient is φ = 166013568.

The previous prime is 213401893. The next prime is 213401917. The reversal of 213401905 is 509104312.

It is an interprime number because it is at equal distance from previous prime (213401893) and next prime (213401917).

It is a cyclic number.

It is not a de Polignac number, because 213401905 - 2⁵ = 213401873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213401905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49309 + ... + 53461.

It is an arithmetic number, because the mean of its divisors is an integer number (16449840).

Almost surely, 2^213401905 is an apocalyptic number.

It is an amenable number.

213401905 is a deficient number, since it is larger than the sum of its proper divisors (49795535).

213401905 is a wasteful number, since it uses less digits than its factorization.

213401905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4440.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 213401905 is about 14608.2820687444. The cubic root of 213401905 is about 597.5846463063.

The spelling of 213401905 in words is "two hundred thirteen million, four hundred one thousand, nine hundred five".