213340631 has 8 divisors (see below), whose sum is σ = 250407840. Its totient is φ = 177920928.

The previous prime is 213340619. The next prime is 213340669. The reversal of 213340631 is 136043312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213340631 - 2¹⁸ = 213078487 is a prime.

It is a super-2 number, since 2×213340631² = 91028449670956322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213340597 and 213340606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213340681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411596 + ... + 412113.

It is an arithmetic number, because the mean of its divisors is an integer number (31300980).

Almost surely, 2^213340631 is an apocalyptic number.

213340631 is a deficient number, since it is larger than the sum of its proper divisors (37067209).

213340631 is an equidigital number, since it uses as much as digits as its factorization.

213340631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823753.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 213340631 is about 14606.1846832087. The cubic root of 213340631 is about 597.5274460879.

Adding to 213340631 its reverse (136043312), we get a palindrome (349383943).

The spelling of 213340631 in words is "two hundred thirteen million, three hundred forty thousand, six hundred thirty-one".