221257252 has 12 divisors (see below), whose sum is σ = 389799900. Its totient is φ = 109885856.

The previous prime is 221257243. The next prime is 221257271. The reversal of 221257252 is 252752122.

It can be written as a sum of positive squares in 2 ways, for example, as 19219456 + 202037796 = 4384^2 + 14214^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221257252.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185023 + ... + 186214.

It is an arithmetic number, because the mean of its divisors is an integer number (32483325).

Almost surely, 2^221257252 is an apocalyptic number.

It is an amenable number.

221257252 is a deficient number, since it is larger than the sum of its proper divisors (168542648).

221257252 is a wasteful number, since it uses less digits than its factorization.

221257252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371390 (or 371388 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 221257252 is about 14874.7185519592. The cubic root of 221257252 is about 604.8288585431.

The spelling of 221257252 in words is "two hundred twenty-one million, two hundred fifty-seven thousand, two hundred fifty-two".