221312001213 has 6 divisors (see below), whose sum is σ = 319672890654. Its totient is φ = 147541334136.

The previous prime is 221312001181. The next prime is 221312001247. The reversal of 221312001213 is 312100213122.

221312001213 is a `hidden beast` number, since 221 + 31 + 200 + 1 + 213 = 666.

It can be written as a sum of positive squares in only one way, i.e., 165598535844 + 55713465369 = 406938^2 + 236037^2 .

It is not a de Polignac number, because 221312001213 - 2⁵ = 221312001181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312002213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12295111170 + ... + 12295111187.

It is an arithmetic number, because the mean of its divisors is an integer number (53278815109).

Almost surely, 2^221312001213 is an apocalyptic number.

It is an amenable number.

221312001213 is a deficient number, since it is larger than the sum of its proper divisors (98360889441).

221312001213 is a wasteful number, since it uses less digits than its factorization.

221312001213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24590222363 (or 24590222360 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221312001213 its reverse (312100213122), we get a palindrome (533412214335).

The spelling of 221312001213 in words is "two hundred twenty-one billion, three hundred twelve million, one thousand, two hundred thirteen".