221155453 has 2 divisors, whose sum is σ = 221155454. Its totient is φ = 221155452.

The previous prime is 221155433. The next prime is 221155481. The reversal of 221155453 is 354551122.

It is an a-pointer prime, because the next prime (221155481) can be obtained adding 221155453 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220284964 + 870489 = 14842^2 + 933^2 .

It is a cyclic number.

It is not a de Polignac number, because 221155453 - 2¹⁷ = 221024381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221155433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110577726 + 110577727.

It is an arithmetic number, because the mean of its divisors is an integer number (110577727).

Almost surely, 2^221155453 is an apocalyptic number.

It is an amenable number.

221155453 is a deficient number, since it is larger than the sum of its proper divisors (1).

221155453 is an equidigital number, since it uses as much as digits as its factorization.

221155453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 28.

The square root of 221155453 is about 14871.2962784016. The cubic root of 221155453 is about 604.7360850594.

The spelling of 221155453 in words is "two hundred twenty-one million, one hundred fifty-five thousand, four hundred fifty-three".