221263973 has 16 divisors (see below), whose sum is σ = 256857216. Its totient is φ = 186684480.

The previous prime is 221263969. The next prime is 221264009. The reversal of 221263973 is 379362122.

It is a cyclic number.

It is not a de Polignac number, because 221263973 - 2² = 221263969 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221263573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216203 + ... + 217223.

It is an arithmetic number, because the mean of its divisors is an integer number (16053576).

Almost surely, 2^221263973 is an apocalyptic number.

It is an amenable number.

221263973 is a deficient number, since it is larger than the sum of its proper divisors (35593243).

221263973 is a wasteful number, since it uses less digits than its factorization.

221263973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484.

The product of its digits is 27216, while the sum is 35.

The square root of 221263973 is about 14874.9444704846. The cubic root of 221263973 is about 604.8349826567.

The spelling of 221263973 in words is "two hundred twenty-one million, two hundred sixty-three thousand, nine hundred seventy-three".