121530315 has 16 divisors (see below), whose sum is σ = 194780448. Its totient is φ = 64705536.

The previous prime is 121530307. The next prime is 121530319. The reversal of 121530315 is 513035121.

It is not a de Polignac number, because 121530315 - 2³ = 121530307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121530291 and 121530300.

It is not an unprimeable number, because it can be changed into a prime (121530319) 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, 2587 + ... + 15803.

It is an arithmetic number, because the mean of its divisors is an integer number (12173778).

Almost surely, 2^121530315 is an apocalyptic number.

121530315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121530315 is a deficient number, since it is larger than the sum of its proper divisors (73250133).

121530315 is a wasteful number, since it uses less digits than its factorization.

121530315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13838.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 121530315 is about 11024.0788730850. The cubic root of 121530315 is about 495.3302764703.

Adding to 121530315 its reverse (513035121), we get a palindrome (634565436).

The spelling of 121530315 in words is "one hundred twenty-one million, five hundred thirty thousand, three hundred fifteen".