121545454515 has 16 divisors (see below), whose sum is σ = 204708134400. Its totient is φ = 61412440032.

The previous prime is 121545454469. The next prime is 121545454549. The reversal of 121545454515 is 515454545121.

It is not a de Polignac number, because 121545454515 - 2⁶ = 121545454451 is a prime.

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, 213237355 + ... + 213237924.

It is an arithmetic number, because the mean of its divisors is an integer number (12794258400).

Almost surely, 2^121545454515 is an apocalyptic number.

121545454515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121545454515 is a deficient number, since it is larger than the sum of its proper divisors (83162679885).

121545454515 is a wasteful number, since it uses less digits than its factorization.

121545454515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426475306.

The product of its digits is 400000, while the sum is 42.

Adding to 121545454515 its reverse (515454545121), we get a palindrome (636999999636).

The spelling of 121545454515 in words is "one hundred twenty-one billion, five hundred forty-five million, four hundred fifty-four thousand, five hundred fifteen".