121215723 has 16 divisors (see below), whose sum is σ = 164694816. Its totient is φ = 79280640.

The previous prime is 121215719. The next prime is 121215749. The reversal of 121215723 is 327512121.

It is not a de Polignac number, because 121215723 - 2² = 121215719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121215693 and 121215702.

It is not an unprimeable number, because it can be changed into a prime (121215713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107961 + ... + 109077.

It is an arithmetic number, because the mean of its divisors is an integer number (10293426).

Almost surely, 2^121215723 is an apocalyptic number.

121215723 is a deficient number, since it is larger than the sum of its proper divisors (43479093).

121215723 is a wasteful number, since it uses less digits than its factorization.

121215723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774.

The product of its digits is 840, while the sum is 24.

The square root of 121215723 is about 11009.8012243637. The cubic root of 121215723 is about 494.9025050309.

Adding to 121215723 its reverse (327512121), we get a palindrome (448727844).

The spelling of 121215723 in words is "one hundred twenty-one million, two hundred fifteen thousand, seven hundred twenty-three".