221454005623 has 2 divisors, whose sum is σ = 221454005624. Its totient is φ = 221454005622.

The previous prime is 221454005527. The next prime is 221454005629. The reversal of 221454005623 is 326500454122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221454005623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221454005629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110727002811 + 110727002812.

It is an arithmetic number, because the mean of its divisors is an integer number (110727002812).

Almost surely, 2^221454005623 is an apocalyptic number.

221454005623 is a deficient number, since it is larger than the sum of its proper divisors (1).

221454005623 is an equidigital number, since it uses as much as digits as its factorization.

221454005623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 221454005623 its reverse (326500454122), we get a palindrome (547954459745).

The spelling of 221454005623 in words is "two hundred twenty-one billion, four hundred fifty-four million, five thousand, six hundred twenty-three".