221301232213 has 4 divisors (see below), whose sum is σ = 221332598380. Its totient is φ = 221269866048.

The previous prime is 221301232153. The next prime is 221301232219. The reversal of 221301232213 is 312232103122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 219077355249 + 2223876964 = 468057^2 + 47158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221301232213 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 (221301232219) 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, 15672498 + ... + 15686611.

It is an arithmetic number, because the mean of its divisors is an integer number (55333149595).

Almost surely, 2^221301232213 is an apocalyptic number.

It is an amenable number.

221301232213 is a deficient number, since it is larger than the sum of its proper divisors (31366167).

221301232213 is an equidigital number, since it uses as much as digits as its factorization.

221301232213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31366166.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221301232213 its reverse (312232103122), we get a palindrome (533533335335).

The spelling of 221301232213 in words is "two hundred twenty-one billion, three hundred one million, two hundred thirty-two thousand, two hundred thirteen".