121720585 has 16 divisors (see below), whose sum is σ = 167110272. Its totient is φ = 83376000.

The previous prime is 121720519. The next prime is 121720591. The reversal of 121720585 is 585027121.

It is not a de Polignac number, because 121720585 - 2⁹ = 121720073 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, 62070 + ... + 64000.

It is an arithmetic number, because the mean of its divisors is an integer number (10444392).

Almost surely, 2^121720585 is an apocalyptic number.

It is an amenable number.

121720585 is a deficient number, since it is larger than the sum of its proper divisors (45389687).

121720585 is a wasteful number, since it uses less digits than its factorization.

121720585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3744.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 121720585 is about 11032.7052439554. The cubic root of 121720585 is about 495.5886409499.

The spelling of 121720585 in words is "one hundred twenty-one million, seven hundred twenty thousand, five hundred eighty-five".