221298722 has 18 divisors (see below), whose sum is σ = 339136497. Its totient is φ = 108303624.

The previous prime is 221298713. The next prime is 221298731. The reversal of 221298722 is 227892122.

It is an interprime number because it is at equal distance from previous prime (221298713) and next prime (221298731).

It can be written as a sum of positive squares in 2 ways, for example, as 211382521 + 9916201 = 14539^2 + 3149^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=10519.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1409468 + ... + 1409624.

Almost surely, 2^221298722 is an apocalyptic number.

221298722 is a deficient number, since it is larger than the sum of its proper divisors (117837775).

221298722 is an frugal number, since it uses more digits than its factorization.

221298722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 226 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 221298722 is about 14876.1124626026. The cubic root of 221298722 is about 604.8666436487.

The spelling of 221298722 in words is "two hundred twenty-one million, two hundred ninety-eight thousand, seven hundred twenty-two".