221570272 has 48 divisors (see below), whose sum is σ = 543860352. Its totient is φ = 86325120.

The previous prime is 221570249. The next prime is 221570291. The reversal of 221570272 is 272075122.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 221570272.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42498 + ... + 47425.

It is an arithmetic number, because the mean of its divisors is an integer number (11330424).

Almost surely, 2^221570272 is an apocalyptic number.

221570272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221570272 is an abundant number, since it is smaller than the sum of its proper divisors (322290080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221570272 is a wasteful number, since it uses less digits than its factorization.

221570272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89951 (or 89943 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 221570272 is about 14885.2367129314. The cubic root of 221570272 is about 605.1139479838.

The spelling of 221570272 in words is "two hundred twenty-one million, five hundred seventy thousand, two hundred seventy-two".