221122513 has 4 divisors (see below), whose sum is σ = 232760560. Its totient is φ = 209484468.

The previous prime is 221122511. The next prime is 221122537. The reversal of 221122513 is 315221122.

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 221122513 - 2¹ = 221122511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 11638027 = 221122513 / (2 + 2 + 1 + 1 + 2 + 2 + 5 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221122511) 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, 5818995 + ... + 5819032.

It is an arithmetic number, because the mean of its divisors is an integer number (58190140).

Almost surely, 2^221122513 is an apocalyptic number.

It is an amenable number.

221122513 is a deficient number, since it is larger than the sum of its proper divisors (11638047).

221122513 is a wasteful number, since it uses less digits than its factorization.

221122513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11638046.

The product of its digits is 240, while the sum is 19.

The square root of 221122513 is about 14870.1887345117. The cubic root of 221122513 is about 604.7060594290.

Adding to 221122513 its reverse (315221122), we get a palindrome (536343635).

The spelling of 221122513 in words is "two hundred twenty-one million, one hundred twenty-two thousand, five hundred thirteen".