221981875 has 10 divisors (see below), whose sum is σ = 277389332. Its totient is φ = 177585000.

The previous prime is 221981849. The next prime is 221981897. The reversal of 221981875 is 578189122.

It is a happy number.

It is not a de Polignac number, because 221981875 - 2⁵ = 221981843 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 176961 + ... + 178210.

Almost surely, 2^221981875 is an apocalyptic number.

221981875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221981875 is a deficient number, since it is larger than the sum of its proper divisors (55407457).

221981875 is an frugal number, since it uses more digits than its factorization.

221981875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355191 (or 355176 counting only the distinct ones).

The product of its digits is 80640, while the sum is 43.

The square root of 221981875 is about 14899.0561781611. The cubic root of 221981875 is about 605.4884155597.

The spelling of 221981875 in words is "two hundred twenty-one million, nine hundred eighty-one thousand, eight hundred seventy-five".