213103621 has 4 divisors (see below), whose sum is σ = 213564352. Its totient is φ = 212642892.

The previous prime is 213103613. The next prime is 213103643. The reversal of 213103621 is 126301312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213103621 - 2³ = 213103613 is a prime.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229671 + ... + 230596.

It is an arithmetic number, because the mean of its divisors is an integer number (53391088).

Almost surely, 2^213103621 is an apocalyptic number.

It is an amenable number.

213103621 is a deficient number, since it is larger than the sum of its proper divisors (460731).

213103621 is an equidigital number, since it uses as much as digits as its factorization.

213103621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460730.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 213103621 is about 14598.0690846427. The cubic root of 213103621 is about 597.3060904467.

Adding to 213103621 its reverse (126301312), we get a palindrome (339404933).

The spelling of 213103621 in words is "two hundred thirteen million, one hundred three thousand, six hundred twenty-one".