221011101397 has 2 divisors, whose sum is σ = 221011101398. Its totient is φ = 221011101396.

The previous prime is 221011101331. The next prime is 221011101401. The reversal of 221011101397 is 793101110122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217467399556 + 3543701841 = 466334^2 + 59529^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221011101397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221011101317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505550698 + 110505550699.

It is an arithmetic number, because the mean of its divisors is an integer number (110505550699).

Almost surely, 2^221011101397 is an apocalyptic number.

It is an amenable number.

221011101397 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011101397 is an equidigital number, since it uses as much as digits as its factorization.

221011101397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 28.

The spelling of 221011101397 in words is "two hundred twenty-one billion, eleven million, one hundred one thousand, three hundred ninety-seven".