221040453 has 4 divisors (see below), whose sum is σ = 294720608. Its totient is φ = 147360300.

The previous prime is 221040439. The next prime is 221040467. The reversal of 221040453 is 354040122.

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 an interprime number because it is at equal distance from previous prime (221040439) and next prime (221040467).

It is not a de Polignac number, because 221040453 - 2⁹ = 221039941 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 (221040403) 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, 36840073 + ... + 36840078.

It is an arithmetic number, because the mean of its divisors is an integer number (73680152).

Almost surely, 2^221040453 is an apocalyptic number.

It is an amenable number.

221040453 is a deficient number, since it is larger than the sum of its proper divisors (73680155).

221040453 is an equidigital number, since it uses as much as digits as its factorization.

221040453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73680154.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221040453 is about 14867.4292666890. The cubic root of 221040453 is about 604.6312467257.

Adding to 221040453 its reverse (354040122), we get a palindrome (575080575).

The spelling of 221040453 in words is "two hundred twenty-one million, forty thousand, four hundred fifty-three".