120721715 has 4 divisors (see below), whose sum is σ = 144866064. Its totient is φ = 96577368.

The previous prime is 120721703. The next prime is 120721747. The reversal of 120721715 is 517127021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 517127021 = 16411 ⋅31511.

It is a cyclic number.

It is not a de Polignac number, because 120721715 - 2¹⁸ = 120459571 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12072167 + ... + 12072176.

It is an arithmetic number, because the mean of its divisors is an integer number (36216516).

Almost surely, 2^120721715 is an apocalyptic number.

120721715 is a deficient number, since it is larger than the sum of its proper divisors (24144349).

120721715 is an equidigital number, since it uses as much as digits as its factorization.

120721715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24144348.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 120721715 is about 10987.3434004768. The cubic root of 120721715 is about 494.2292736653.

Adding to 120721715 its reverse (517127021), we get a palindrome (637848736).

It can be divided in two parts, 1207 and 21715, that added together give a palindrome (22922).

The spelling of 120721715 in words is "one hundred twenty million, seven hundred twenty-one thousand, seven hundred fifteen".