121023817 has 4 divisors (see below), whose sum is σ = 123007876. Its totient is φ = 119039760.

The previous prime is 121023803. The next prime is 121023821. The reversal of 121023817 is 718320121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 718320121 = 311 ⋅2309711.

It can be written as a sum of positive squares in 2 ways, for example, as 49857721 + 71166096 = 7061^2 + 8436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121023817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121023791 and 121023800.

It is not an unprimeable number, because it can be changed into a prime (121023827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 991938 + ... + 992059.

It is an arithmetic number, because the mean of its divisors is an integer number (30751969).

Almost surely, 2^121023817 is an apocalyptic number.

It is an amenable number.

121023817 is a deficient number, since it is larger than the sum of its proper divisors (1984059).

121023817 is an equidigital number, since it uses as much as digits as its factorization.

121023817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984058.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 121023817 is about 11001.0825376415. The cubic root of 121023817 is about 494.6411942522.

Adding to 121023817 its reverse (718320121), we get a palindrome (839343938).

The spelling of 121023817 in words is "one hundred twenty-one million, twenty-three thousand, eight hundred seventeen".