117215621 has 2 divisors, whose sum is σ = 117215622. Its totient is φ = 117215620.

The previous prime is 117215563. The next prime is 117215633. The reversal of 117215621 is 126512711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74822500 + 42393121 = 8650^2 + 6511^2 .

It is a cyclic number.

It is not a de Polignac number, because 117215621 - 2¹⁸ = 116953477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117215641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58607810 + 58607811.

It is an arithmetic number, because the mean of its divisors is an integer number (58607811).

Almost surely, 2^117215621 is an apocalyptic number.

It is an amenable number.

117215621 is a deficient number, since it is larger than the sum of its proper divisors (1).

117215621 is an equidigital number, since it uses as much as digits as its factorization.

117215621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 26.

The square root of 117215621 is about 10826.6163227483. The cubic root of 117215621 is about 489.3975951241.

The spelling of 117215621 in words is "one hundred seventeen million, two hundred fifteen thousand, six hundred twenty-one".