221995 has 8 divisors (see below), whose sum is σ = 275760. Its totient is φ = 171360.

The previous prime is 221989. The next prime is 221999. The reversal of 221995 is 599122.

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

It is not a de Polignac number, because 221995 - 2³ = 221987 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (221999) 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, 621 + ... + 910.

It is an arithmetic number, because the mean of its divisors is an integer number (34470).

2²²¹⁹⁹⁵ is an apocalyptic number.

221995 is a deficient number, since it is larger than the sum of its proper divisors (53765).

221995 is a wasteful number, since it uses less digits than its factorization.

221995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565.

The product of its digits is 1620, while the sum is 28.

The square root of 221995 is about 471.1634535912. The cubic root of 221995 is about 60.5500348784.

The spelling of 221995 in words is "two hundred twenty-one thousand, nine hundred ninety-five".