221023005 has 32 divisors (see below), whose sum is σ = 414021888. Its totient is φ = 98572800.

The previous prime is 221023003. The next prime is 221023013. The reversal of 221023005 is 500320122.

221023005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221023005 - 2¹ = 221023003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221023003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21366 + ... + 29975.

It is an arithmetic number, because the mean of its divisors is an integer number (12938184).

Almost surely, 2^221023005 is an apocalyptic number.

It is an amenable number.

221023005 is a deficient number, since it is larger than the sum of its proper divisors (192998883).

221023005 is a wasteful number, since it uses less digits than its factorization.

221023005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51397.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 221023005 is about 14866.8424690652. The cubic root of 221023005 is about 604.6153372946.

Adding to 221023005 its reverse (500320122), we get a palindrome (721343127).

The spelling of 221023005 in words is "two hundred twenty-one million, twenty-three thousand, five".