221220250 has 16 divisors (see below), whose sum is σ = 414124776. Its totient is φ = 88488000.

The previous prime is 221220229. The next prime is 221220257. The reversal of 221220250 is 52022122.

It can be written as a sum of positive squares in 4 ways, for example, as 38402809 + 182817441 = 6197^2 + 13521^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220257) 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, 442191 + ... + 442690.

Almost surely, 2^221220250 is an apocalyptic number.

221220250 is a deficient number, since it is larger than the sum of its proper divisors (192904526).

221220250 is an equidigital number, since it uses as much as digits as its factorization.

221220250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884898 (or 884888 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 221220250 is about 14873.4747117141. The cubic root of 221220250 is about 604.7951404391.

Adding to 221220250 its reverse (52022122), we get a palindrome (273242372).

The spelling of 221220250 in words is "two hundred twenty-one million, two hundred twenty thousand, two hundred fifty".