221995012597 has 2 divisors, whose sum is σ = 221995012598. Its totient is φ = 221995012596.

The previous prime is 221995012559. The next prime is 221995012621. The reversal of 221995012597 is 795210599122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209479220721 + 12515791876 = 457689^2 + 111874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221995012597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221995012517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110997506298 + 110997506299.

It is an arithmetic number, because the mean of its divisors is an integer number (110997506299).

Almost surely, 2^221995012597 is an apocalyptic number.

It is an amenable number.

221995012597 is a deficient number, since it is larger than the sum of its proper divisors (1).

221995012597 is an equidigital number, since it uses as much as digits as its factorization.

221995012597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The spelling of 221995012597 in words is "two hundred twenty-one billion, nine hundred ninety-five million, twelve thousand, five hundred ninety-seven".