121512416 has 24 divisors (see below), whose sum is σ = 239521464. Its totient is φ = 60681600.

The previous prime is 121512401. The next prime is 121512431. The reversal of 121512416 is 614215121.

It is an interprime number because it is at equal distance from previous prime (121512401) and next prime (121512431).

It is a junction number, because it is equal to n+sod(n) for n = 121512391 and 121512400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31826 + ... + 35438.

It is an arithmetic number, because the mean of its divisors is an integer number (9980061).

Almost surely, 2^121512416 is an apocalyptic number.

121512416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121512416 is a deficient number, since it is larger than the sum of its proper divisors (118009048).

121512416 is a wasteful number, since it uses less digits than its factorization.

121512416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674 (or 4666 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 121512416 is about 11023.2670293339. The cubic root of 121512416 is about 495.3059578413.

Adding to 121512416 its reverse (614215121), we get a palindrome (735727537).

It can be divided in two parts, 1215 and 12416, that added together give a palindrome (13631).

The spelling of 121512416 in words is "one hundred twenty-one million, five hundred twelve thousand, four hundred sixteen".