221017023 has 12 divisors (see below), whose sum is σ = 319375680. Its totient is φ = 147285216.

The previous prime is 221017007. The next prime is 221017037. The reversal of 221017023 is 320710122.

It is not a de Polignac number, because 221017023 - 2⁴ = 221017007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221016987 and 221017005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221017123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41490 + ... + 46512.

It is an arithmetic number, because the mean of its divisors is an integer number (26614640).

Almost surely, 2^221017023 is an apocalyptic number.

221017023 is a deficient number, since it is larger than the sum of its proper divisors (98358657).

221017023 is a wasteful number, since it uses less digits than its factorization.

221017023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9918 (or 9915 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 221017023 is about 14866.6412817422. The cubic root of 221017023 is about 604.6098825960.

Adding to 221017023 its reverse (320710122), we get a palindrome (541727145).

The spelling of 221017023 in words is "two hundred twenty-one million, seventeen thousand, twenty-three".