221023453 has 4 divisors (see below), whose sum is σ = 252598240. Its totient is φ = 189448668.

The previous prime is 221023427. The next prime is 221023457. The reversal of 221023453 is 354320122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221023453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221023457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15787383 + ... + 15787396.

It is an arithmetic number, because the mean of its divisors is an integer number (63149560).

Almost surely, 2^221023453 is an apocalyptic number.

It is an amenable number.

221023453 is a deficient number, since it is larger than the sum of its proper divisors (31574787).

221023453 is an equidigital number, since it uses as much as digits as its factorization.

221023453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31574786.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 221023453 is about 14866.8575361439. The cubic root of 221023453 is about 604.6157458003.

Adding to 221023453 its reverse (354320122), we get a palindrome (575343575).

The spelling of 221023453 in words is "two hundred twenty-one million, twenty-three thousand, four hundred fifty-three".