121320045 has 96 divisors (see below), whose sum is σ = 271192320. Its totient is φ = 50371200.

The previous prime is 121320037. The next prime is 121320047. The reversal of 121320045 is 540023121.

It is not a de Polignac number, because 121320045 - 2³ = 121320037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121320047) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 113815 + ... + 114875.

It is an arithmetic number, because the mean of its divisors is an integer number (2824920).

Almost surely, 2^121320045 is an apocalyptic number.

121320045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121320045 is an abundant number, since it is smaller than the sum of its proper divisors (149872275).

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

121320045 is a wasteful number, since it uses less digits than its factorization.

121320045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104 (or 1087 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 121320045 is about 11014.5378931665. The cubic root of 121320045 is about 495.0444404545.

Adding to 121320045 its reverse (540023121), we get a palindrome (661343166).

The spelling of 121320045 in words is "one hundred twenty-one million, three hundred twenty thousand, forty-five".