221210313 has 4 divisors (see below), whose sum is σ = 294947088. Its totient is φ = 147473540.

The previous prime is 221210303. The next prime is 221210321. The reversal of 221210313 is 313012122.

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 221210313 - 2⁵ = 221210281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221210292 and 221210301.

It is not an unprimeable number, because it can be changed into a prime (221210303) 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, 36868383 + ... + 36868388.

It is an arithmetic number, because the mean of its divisors is an integer number (73736772).

Almost surely, 2^221210313 is an apocalyptic number.

It is an amenable number.

221210313 is a deficient number, since it is larger than the sum of its proper divisors (73736775).

221210313 is an equidigital number, since it uses as much as digits as its factorization.

221210313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73736774.

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

The square root of 221210313 is about 14873.1406569023. The cubic root of 221210313 is about 604.7860846990.

Adding to 221210313 its reverse (313012122), we get a palindrome (534222435).

The spelling of 221210313 in words is "two hundred twenty-one million, two hundred ten thousand, three hundred thirteen".