213404434 has 16 divisors (see below), whose sum is σ = 349871616. Its totient is φ = 97185600.

The previous prime is 213404431. The next prime is 213404449. The reversal of 213404434 is 434404312.

It is a junction number, because it is equal to n+sod(n) for n = 213404399 and 213404408.

It is not an unprimeable number, because it can be changed into a prime (213404431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100182 + ... + 102289.

It is an arithmetic number, because the mean of its divisors is an integer number (21866976).

Almost surely, 2^213404434 is an apocalyptic number.

213404434 is a deficient number, since it is larger than the sum of its proper divisors (136467182).

213404434 is a wasteful number, since it uses less digits than its factorization.

213404434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202521.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 213404434 is about 14608.3686289743. The cubic root of 213404434 is about 597.5870069312.

Adding to 213404434 its reverse (434404312), we get a palindrome (647808746).

The spelling of 213404434 in words is "two hundred thirteen million, four hundred four thousand, four hundred thirty-four".