213103221 has 16 divisors (see below), whose sum is σ = 304166400. Its totient is φ = 132308208.

The previous prime is 213103201. The next prime is 213103237. The reversal of 213103221 is 122301312.

It is not a de Polignac number, because 213103221 - 2⁶ = 213103157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213103221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213103201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28321 + ... + 35046.

It is an arithmetic number, because the mean of its divisors is an integer number (19010400).

Almost surely, 2^213103221 is an apocalyptic number.

It is an amenable number.

213103221 is a deficient number, since it is larger than the sum of its proper divisors (91063179).

213103221 is a wasteful number, since it uses less digits than its factorization.

213103221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63448.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 213103221 is about 14598.0553841942. The cubic root of 213103221 is about 597.3057167278.

Adding to 213103221 its reverse (122301312), we get a palindrome (335404533).

It can be divided in two parts, 21310 and 3221, that added together give a triangular number (24531 = T₂₂₁).

The spelling of 213103221 in words is "two hundred thirteen million, one hundred three thousand, two hundred twenty-one".