117101821 has 2 divisors, whose sum is σ = 117101822. Its totient is φ = 117101820.

The previous prime is 117101813. The next prime is 117101869. The reversal of 117101821 is 128101711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67469796 + 49632025 = 8214^2 + 7045^2 .

It is an emirp because it is prime and its reverse (128101711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117101821 - 2³ = 117101813 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 117101792 and 117101801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117101891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58550910 + 58550911.

It is an arithmetic number, because the mean of its divisors is an integer number (58550911).

Almost surely, 2^117101821 is an apocalyptic number.

It is an amenable number.

117101821 is a deficient number, since it is larger than the sum of its proper divisors (1).

117101821 is an equidigital number, since it uses as much as digits as its factorization.

117101821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 22.

The square root of 117101821 is about 10821.3594802132. The cubic root of 117101821 is about 489.2391649334.

It can be divided in two parts, 11710 and 1821, that added together give a palindrome (13531).

The spelling of 117101821 in words is "one hundred seventeen million, one hundred one thousand, eight hundred twenty-one".