117221521 has 2 divisors, whose sum is σ = 117221522. Its totient is φ = 117221520.

The previous prime is 117221491. The next prime is 117221527. The reversal of 117221521 is 125122711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72063121 + 45158400 = 8489^2 + 6720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117221521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 117221492 and 117221501.

It is not a weakly prime, because it can be changed into another prime (117221527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58610760 + 58610761.

It is an arithmetic number, because the mean of its divisors is an integer number (58610761).

Almost surely, 2^117221521 is an apocalyptic number.

It is an amenable number.

117221521 is a deficient number, since it is larger than the sum of its proper divisors (1).

117221521 is an equidigital number, since it uses as much as digits as its factorization.

117221521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 22.

The square root of 117221521 is about 10826.8887959561. Note that the first 3 decimals coincide. The cubic root of 117221521 is about 489.4058061951.

The spelling of 117221521 in words is "one hundred seventeen million, two hundred twenty-one thousand, five hundred twenty-one".