213401705 has 16 divisors (see below), whose sum is σ = 291510144. Its totient is φ = 148452480.

The previous prime is 213401701. The next prime is 213401723. The reversal of 213401705 is 507104312.

It is not a de Polignac number, because 213401705 - 2² = 213401701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213401701) by changing a digit.

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, 83084 + ... + 85613.

It is an arithmetic number, because the mean of its divisors is an integer number (18219384).

Almost surely, 2^213401705 is an apocalyptic number.

It is an amenable number.

213401705 is a deficient number, since it is larger than the sum of its proper divisors (78108439).

213401705 is a wasteful number, since it uses less digits than its factorization.

213401705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168736.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 213401705 is about 14608.2752233109. The cubic root of 213401705 is about 597.5844596210.

The spelling of 213401705 in words is "two hundred thirteen million, four hundred one thousand, seven hundred five".