221013284 has 12 divisors (see below), whose sum is σ = 397226844. Its totient is φ = 107519904.

The previous prime is 221013283. The next prime is 221013319. The reversal of 221013284 is 482310122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 214622500 + 6390784 = 14650^2 + 2528^2 .

It is not an unprimeable number, because it can be changed into a prime (221013283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746519 + ... + 746814.

It is an arithmetic number, because the mean of its divisors is an integer number (33102237).

Almost surely, 2^221013284 is an apocalyptic number.

It is an amenable number.

221013284 is a deficient number, since it is larger than the sum of its proper divisors (176213560).

221013284 is a wasteful number, since it uses less digits than its factorization.

221013284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493374 (or 1493372 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 221013284 is about 14866.5155298745. The cubic root of 221013284 is about 604.6064731315.

The spelling of 221013284 in words is "two hundred twenty-one million, thirteen thousand, two hundred eighty-four".