221270 has 32 divisors (see below), whose sum is σ = 475200. Its totient is φ = 72576.

The previous prime is 221261. The next prime is 221281. The reversal of 221270 is 72122.

221270 = T₂₉₅ + T₂₉₆ + ... + T₂₉₉.

221270 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1976 + ... + 2084.

It is an arithmetic number, because the mean of its divisors is an integer number (14850).

2²²¹²⁷⁰ is an apocalyptic number.

221270 is an abundant number, since it is smaller than the sum of its proper divisors (253930).

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

221270 is a wasteful number, since it uses less digits than its factorization.

221270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 221270 is about 470.3934523354. The cubic root of 221270 is about 60.4840474298.

Adding to 221270 its reverse (72122), we get a palindrome (293392).

The spelling of 221270 in words is "two hundred twenty-one thousand, two hundred seventy", and thus it is an iban number.