221245274 has 16 divisors (see below), whose sum is σ = 342897408. Its totient is φ = 106982352.

The previous prime is 221245229. The next prime is 221245333. The reversal of 221245274 is 472542122.

221245274 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3407 + ... + 21309.

It is an arithmetic number, because the mean of its divisors is an integer number (21431088).

Almost surely, 2^221245274 is an apocalyptic number.

221245274 is a deficient number, since it is larger than the sum of its proper divisors (121652134).

221245274 is a wasteful number, since it uses less digits than its factorization.

221245274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18109.

The product of its digits is 8960, while the sum is 29.

The square root of 221245274 is about 14874.3159170430. The cubic root of 221245274 is about 604.8179439920.

Adding to 221245274 its reverse (472542122), we get a palindrome (693787396).

The spelling of 221245274 in words is "two hundred twenty-one million, two hundred forty-five thousand, two hundred seventy-four".