221302101997 has 2 divisors, whose sum is σ = 221302101998. Its totient is φ = 221302101996.

The previous prime is 221302101959. The next prime is 221302102001. The reversal of 221302101997 is 799101203122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154331908201 + 66970193796 = 392851^2 + 258786^2 .

It is a cyclic number.

It is not a de Polignac number, because 221302101997 - 2²⁷ = 221167884269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221302101197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110651050998 + 110651050999.

It is an arithmetic number, because the mean of its divisors is an integer number (110651050999).

Almost surely, 2^221302101997 is an apocalyptic number.

It is an amenable number.

221302101997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221302101997 is an equidigital number, since it uses as much as digits as its factorization.

221302101997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 221302101997 in words is "two hundred twenty-one billion, three hundred two million, one hundred one thousand, nine hundred ninety-seven".