101115221 has 2 divisors, whose sum is σ = 101115222. Its totient is φ = 101115220.

The previous prime is 101115197. The next prime is 101115227. The reversal of 101115221 is 122511101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72063121 + 29052100 = 8489^2 + 5390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101115221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101115196 and 101115205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101115227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50557610 + 50557611.

It is an arithmetic number, because the mean of its divisors is an integer number (50557611).

Almost surely, 2^101115221 is an apocalyptic number.

It is an amenable number.

101115221 is a deficient number, since it is larger than the sum of its proper divisors (1).

101115221 is an equidigital number, since it uses as much as digits as its factorization.

101115221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 101115221 is about 10055.6064461573. The cubic root of 101115221 is about 465.8779743368.

Adding to 101115221 its reverse (122511101), we get a palindrome (223626322).

The spelling of 101115221 in words is "one hundred one million, one hundred fifteen thousand, two hundred twenty-one".