221838827 has 12 divisors (see below), whose sum is σ = 258417936. Its totient is φ = 189882000.

The previous prime is 221838811. The next prime is 221838833. The reversal of 221838827 is 728838122.

It is a happy number.

It is not a de Polignac number, because 221838827 - 2⁴ = 221838811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221838847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37577 + ... + 43077.

It is an arithmetic number, because the mean of its divisors is an integer number (21534828).

Almost surely, 2^221838827 is an apocalyptic number.

221838827 is a deficient number, since it is larger than the sum of its proper divisors (36579109).

221838827 is an equidigital number, since it uses as much as digits as its factorization.

221838827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6338 (or 6331 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The square root of 221838827 is about 14894.2548319814. The cubic root of 221838827 is about 605.3583260819.

The spelling of 221838827 in words is "two hundred twenty-one million, eight hundred thirty-eight thousand, eight hundred twenty-seven".