221103553453 has 2 divisors, whose sum is σ = 221103553454. Its totient is φ = 221103553452.

The previous prime is 221103553399. The next prime is 221103553493. The reversal of 221103553453 is 354355301122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117997059049 + 103106494404 = 343507^2 + 321102^2 .

It is a cyclic number.

It is not a de Polignac number, because 221103553453 - 2¹³ = 221103545261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221103553493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110551776726 + 110551776727.

It is an arithmetic number, because the mean of its divisors is an integer number (110551776727).

Almost surely, 2^221103553453 is an apocalyptic number.

It is an amenable number.

221103553453 is a deficient number, since it is larger than the sum of its proper divisors (1).

221103553453 is an equidigital number, since it uses as much as digits as its factorization.

221103553453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 34.

Adding to 221103553453 its reverse (354355301122), we get a palindrome (575458854575).

The spelling of 221103553453 in words is "two hundred twenty-one billion, one hundred three million, five hundred fifty-three thousand, four hundred fifty-three".