221513045 has 8 divisors (see below), whose sum is σ = 286263096. Its totient is φ = 163578816.

The previous prime is 221512999. The next prime is 221513053. The reversal of 221513045 is 540315122.

It can be written as a sum of positive squares in 4 ways, for example, as 27133681 + 194379364 = 5209^2 + 13942^2 .

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 221513045 - 2¹⁰ = 221512021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221513045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1703882 + ... + 1704011.

It is an arithmetic number, because the mean of its divisors is an integer number (35782887).

Almost surely, 2^221513045 is an apocalyptic number.

It is an amenable number.

221513045 is a deficient number, since it is larger than the sum of its proper divisors (64750051).

221513045 is a wasteful number, since it uses less digits than its factorization.

221513045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3407911.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 221513045 is about 14883.3143150308. The cubic root of 221513045 is about 605.0618473758.

Adding to 221513045 its reverse (540315122), we get a palindrome (761828167).

The spelling of 221513045 in words is "two hundred twenty-one million, five hundred thirteen thousand, forty-five".