221115043453 has 4 divisors (see below), whose sum is σ = 221116221568. Its totient is φ = 221113865340.

The previous prime is 221115043451. The next prime is 221115043469. The reversal of 221115043453 is 354340511122.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221115043453 - 2¹ = 221115043451 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 (221115043451) 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, 237651 + ... + 706192.

It is an arithmetic number, because the mean of its divisors is an integer number (55279055392).

Almost surely, 2^221115043453 is an apocalyptic number.

It is an amenable number.

221115043453 is a deficient number, since it is larger than the sum of its proper divisors (1178115).

221115043453 is an equidigital number, since it uses as much as digits as its factorization.

221115043453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178114.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 221115043453 its reverse (354340511122), we get a palindrome (575455554575).

The spelling of 221115043453 in words is "two hundred twenty-one billion, one hundred fifteen million, forty-three thousand, four hundred fifty-three".