213103631 has 4 divisors (see below), whose sum is σ = 229496232. Its totient is φ = 196711032.

The previous prime is 213103613. The next prime is 213103643. The reversal of 213103631 is 136301312.

It is a happy number.

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 213103631 - 2²⁶ = 145994767 is a prime.

It is a super-2 number, since 2×213103631² = 90826315090768322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213103651) 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, 8196281 + ... + 8196306.

It is an arithmetic number, because the mean of its divisors is an integer number (57374058).

Almost surely, 2^213103631 is an apocalyptic number.

213103631 is a deficient number, since it is larger than the sum of its proper divisors (16392601).

213103631 is a wasteful number, since it uses less digits than its factorization.

213103631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16392600.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 213103631 is about 14598.0694271537. The cubic root of 213103631 is about 597.3060997897.

Adding to 213103631 its reverse (136301312), we get a palindrome (349404943).

The spelling of 213103631 in words is "two hundred thirteen million, one hundred three thousand, six hundred thirty-one".