121320515 has 16 divisors (see below), whose sum is σ = 156819456. Its totient is φ = 89839200.

The previous prime is 121320481. The next prime is 121320523. The reversal of 121320515 is 515023121.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-121320515 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13451 + ... + 20580.

It is an arithmetic number, because the mean of its divisors is an integer number (9801216).

Almost surely, 2^121320515 is an apocalyptic number.

121320515 is a deficient number, since it is larger than the sum of its proper divisors (35498941).

121320515 is a wasteful number, since it uses less digits than its factorization.

121320515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34090.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 121320515 is about 11014.5592285847. The cubic root of 121320515 is about 495.0450797294.

Adding to 121320515 its reverse (515023121), we get a palindrome (636343636).

The spelling of 121320515 in words is "one hundred twenty-one million, three hundred twenty thousand, five hundred fifteen".