121520855 has 8 divisors (see below), whose sum is σ = 145884192. Its totient is φ = 97177248.

The previous prime is 121520821. The next prime is 121520857. The reversal of 121520855 is 558025121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121520855 - 2²² = 117326551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121520857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22037 + ... + 26993.

It is an arithmetic number, because the mean of its divisors is an integer number (18235524).

Almost surely, 2^121520855 is an apocalyptic number.

121520855 is a deficient number, since it is larger than the sum of its proper divisors (24363337).

121520855 is an equidigital number, since it uses as much as digits as its factorization.

121520855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9865.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 121520855 is about 11023.6498039442. The cubic root of 121520855 is about 495.3174238581.

Adding to 121520855 its reverse (558025121), we get a palindrome (679545976).

The spelling of 121520855 in words is "one hundred twenty-one million, five hundred twenty thousand, eight hundred fifty-five".