121516530 has 32 divisors (see below), whose sum is σ = 295640064. Its totient is φ = 31959936.

The previous prime is 121516529. The next prime is 121516531. The reversal of 121516530 is 35615121.

It is an interprime number because it is at equal distance from previous prime (121516529) and next prime (121516531).

It is a self number, because there is not a number n which added to its sum of digits gives 121516530.

It is not an unprimeable number, because it can be changed into a prime (121516531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25554 + ... + 29933.

It is an arithmetic number, because the mean of its divisors is an integer number (9238752).

Almost surely, 2^121516530 is an apocalyptic number.

121516530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121516530 is an abundant number, since it is smaller than the sum of its proper divisors (174123534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121516530 is a wasteful number, since it uses less digits than its factorization.

121516530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55570.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 121516530 is about 11023.4536330499. The cubic root of 121516530 is about 495.3115475739.

It can be divided in two parts, 12151 and 6530, that added together give a palindrome (18681).

The spelling of 121516530 in words is "one hundred twenty-one million, five hundred sixteen thousand, five hundred thirty".