221021102132497 has 2 divisors, whose sum is σ = 221021102132498. Its totient is φ = 221021102132496.

The previous prime is 221021102132491. The next prime is 221021102132539. The reversal of 221021102132497 is 794231201120122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173707945188561 + 47313156943936 = 13179831^2 + 6878456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221021102132497 is a prime.

It is not a weakly prime, because it can be changed into another prime (221021102132491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510551066248 + 110510551066249.

It is an arithmetic number, because the mean of its divisors is an integer number (110510551066249).

Almost surely, 2^{221021102132497} is an apocalyptic number.

It is an amenable number.

221021102132497 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021102132497 is an equidigital number, since it uses as much as digits as its factorization.

221021102132497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 221021102132497 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred two million, one hundred thirty-two thousand, four hundred ninety-seven".