221020000997 has 2 divisors, whose sum is σ = 221020000998. Its totient is φ = 221020000996.

The previous prime is 221020000973. The next prime is 221020001009. The reversal of 221020000997 is 799000020122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140571755041 + 80448245956 = 374929^2 + 283634^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020000997 - 2⁸ = 221020000741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020000697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510000498 + 110510000499.

It is an arithmetic number, because the mean of its divisors is an integer number (110510000499).

Almost surely, 2^221020000997 is an apocalyptic number.

It is an amenable number.

221020000997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020000997 is an equidigital number, since it uses as much as digits as its factorization.

221020000997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The spelling of 221020000997 in words is "two hundred twenty-one billion, twenty million, nine hundred ninety-seven", and thus it is an aban number.