221955 has 8 divisors (see below), whose sum is σ = 355152. Its totient is φ = 118368.

The previous prime is 221953. The next prime is 221957. The reversal of 221955 is 559122.

It is an interprime number because it is at equal distance from previous prime (221953) and next prime (221957).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221955 - 2¹ = 221953 is a prime.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (221951) 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, 7384 + ... + 7413.

It is an arithmetic number, because the mean of its divisors is an integer number (44394).

2²²¹⁹⁵⁵ is an apocalyptic number.

221955 is a deficient number, since it is larger than the sum of its proper divisors (133197).

221955 is a wasteful number, since it uses less digits than its factorization.

221955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14805.

The product of its digits is 900, while the sum is 24.

The square root of 221955 is about 471.1210035649. The cubic root of 221955 is about 60.5463979394.

It can be divided in two parts, 221 and 955, that added together give a triangular number (1176 = T₄₈).

The spelling of 221955 in words is "two hundred twenty-one thousand, nine hundred fifty-five".