221063491 has 24 divisors (see below), whose sum is σ = 255104640. Its totient is φ = 191157120.

The previous prime is 221063489. The next prime is 221063503. The reversal of 221063491 is 194360122.

It is not a de Polignac number, because 221063491 - 2¹ = 221063489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221063471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255726 + ... + 256588.

It is an arithmetic number, because the mean of its divisors is an integer number (10629360).

Almost surely, 2^221063491 is an apocalyptic number.

221063491 is a deficient number, since it is larger than the sum of its proper divisors (34041149).

221063491 is a wasteful number, since it uses less digits than its factorization.

221063491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987 (or 976 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 221063491 is about 14868.2040273868. The cubic root of 221063491 is about 604.6522519468.

The spelling of 221063491 in words is "two hundred twenty-one million, sixty-three thousand, four hundred ninety-one".