221286052 has 12 divisors (see below), whose sum is σ = 417039196. Its totient is φ = 102132000.

The previous prime is 221286047. The next prime is 221286053. The reversal of 221286052 is 250682122.

It can be written as a sum of positive squares in 2 ways, for example, as 30404196 + 190881856 = 5514^2 + 13816^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 221286052.

It is not an unprimeable number, because it can be changed into a prime (221286053) 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, 2127699 + ... + 2127802.

Almost surely, 2^221286052 is an apocalyptic number.

It is an amenable number.

221286052 is a deficient number, since it is larger than the sum of its proper divisors (195753144).

221286052 is a wasteful number, since it uses less digits than its factorization.

221286052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255518 (or 4255516 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 221286052 is about 14875.6866060024. The cubic root of 221286052 is about 604.8550999661.

The spelling of 221286052 in words is "two hundred twenty-one million, two hundred eighty-six thousand, fifty-two".