221995012553 has 2 divisors, whose sum is σ = 221995012554. Its totient is φ = 221995012552.

The previous prime is 221995012517. The next prime is 221995012559. The reversal of 221995012553 is 355210599122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202795307584 + 19199704969 = 450328^2 + 138563^2 .

It is a cyclic number.

It is not a de Polignac number, because 221995012553 - 2¹⁸ = 221994750409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221995012559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110997506276 + 110997506277.

It is an arithmetic number, because the mean of its divisors is an integer number (110997506277).

Almost surely, 2^221995012553 is an apocalyptic number.

It is an amenable number.

221995012553 is a deficient number, since it is larger than the sum of its proper divisors (1).

221995012553 is an equidigital number, since it uses as much as digits as its factorization.

221995012553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243000, while the sum is 44.

The spelling of 221995012553 in words is "two hundred twenty-one billion, nine hundred ninety-five million, twelve thousand, five hundred fifty-three".