221070 has 16 divisors (see below), whose sum is σ = 530640. Its totient is φ = 58944.

The previous prime is 221069. The next prime is 221071. The reversal of 221070 is 70122.

It is an interprime number because it is at equal distance from previous prime (221069) and next prime (221071).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3655 + ... + 3714.

It is an arithmetic number, because the mean of its divisors is an integer number (33165).

2²²¹⁰⁷⁰ is an apocalyptic number.

221070 is an abundant number, since it is smaller than the sum of its proper divisors (309570).

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

221070 is a wasteful number, since it uses less digits than its factorization.

221070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7379.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 221070 is about 470.1808162824. The cubic root of 221070 is about 60.4658186355.

Adding to 221070 its reverse (70122), we get a palindrome (291192).

The spelling of 221070 in words is "two hundred twenty-one thousand, seventy", and thus it is an iban number.