121392217 has 2 divisors, whose sum is σ = 121392218. Its totient is φ = 121392216.

The previous prime is 121392199. The next prime is 121392241. The reversal of 121392217 is 712293121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120538441 + 853776 = 10979^2 + 924^2 .

It is a cyclic number.

It is not a de Polignac number, because 121392217 - 2¹¹ = 121390169 is a prime.

It is not a weakly prime, because it can be changed into another prime (121392247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60696108 + 60696109.

It is an arithmetic number, because the mean of its divisors is an integer number (60696109).

Almost surely, 2^121392217 is an apocalyptic number.

It is an amenable number.

121392217 is a deficient number, since it is larger than the sum of its proper divisors (1).

121392217 is an equidigital number, since it uses as much as digits as its factorization.

121392217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 121392217 is about 11017.8136215857. The cubic root of 121392217 is about 495.1425865465.

The spelling of 121392217 in words is "one hundred twenty-one million, three hundred ninety-two thousand, two hundred seventeen".