221143274 has 32 divisors (see below), whose sum is σ = 378888192. Its totient is φ = 95886000.

The previous prime is 221143271. The next prime is 221143297. The reversal of 221143274 is 472341122.

221143274 = 92² + 93² + ... + 872².

221143274 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221143271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46139 + ... + 50705.

It is an arithmetic number, because the mean of its divisors is an integer number (11840256).

Almost surely, 2^221143274 is an apocalyptic number.

221143274 is a deficient number, since it is larger than the sum of its proper divisors (157744918).

221143274 is a wasteful number, since it uses less digits than its factorization.

221143274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4682.

The product of its digits is 2688, while the sum is 26.

The square root of 221143274 is about 14870.8867926563. The cubic root of 221143274 is about 604.7249839450.

Adding to 221143274 its reverse (472341122), we get a palindrome (693484396).

The spelling of 221143274 in words is "two hundred twenty-one million, one hundred forty-three thousand, two hundred seventy-four".