221222513 has 8 divisors (see below), whose sum is σ = 234501480. Its totient is φ = 207973120.

The previous prime is 221222509. The next prime is 221222537. The reversal of 221222513 is 315222122.

It can be written as a sum of positive squares in 4 ways, for example, as 34845409 + 186377104 = 5903^2 + 13652^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221222513 - 2² = 221222509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221222213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9083 + ... + 22911.

It is an arithmetic number, because the mean of its divisors is an integer number (29312685).

Almost surely, 2^221222513 is an apocalyptic number.

It is an amenable number.

221222513 is a deficient number, since it is larger than the sum of its proper divisors (13278967).

221222513 is a wasteful number, since it uses less digits than its factorization.

221222513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14787.

The product of its digits is 480, while the sum is 20.

The square root of 221222513 is about 14873.5507865472. The cubic root of 221222513 is about 604.7972027077.

Adding to 221222513 its reverse (315222122), we get a palindrome (536444635).

The spelling of 221222513 in words is "two hundred twenty-one million, two hundred twenty-two thousand, five hundred thirteen".