121231015 has 8 divisors (see below), whose sum is σ = 145536480. Its totient is φ = 96945312.

The previous prime is 121231013. The next prime is 121231021. The reversal of 121231015 is 510132121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121231015 - 2¹ = 121231013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121231015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231013) 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 7 ways as a sum of consecutive naturals, for example, 20181 + ... + 25489.

It is an arithmetic number, because the mean of its divisors is an integer number (18192060).

Almost surely, 2^121231015 is an apocalyptic number.

121231015 is a deficient number, since it is larger than the sum of its proper divisors (24305465).

121231015 is an equidigital number, since it uses as much as digits as its factorization.

121231015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9881.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 121231015 is about 11010.4956745825. The cubic root of 121231015 is about 494.9233156725.

Adding to 121231015 its reverse (510132121), we get a palindrome (631363136).

The spelling of 121231015 in words is "one hundred twenty-one million, two hundred thirty-one thousand, fifteen".