120011721 has 16 divisors (see below), whose sum is σ = 169718400. Its totient is φ = 75172608.

The previous prime is 120011719. The next prime is 120011729. The reversal of 120011721 is 127110021.

It is not a de Polignac number, because 120011721 - 2¹ = 120011719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120011721.

It is not an unprimeable number, because it can be changed into a prime (120011729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34500 + ... + 37818.

It is an arithmetic number, because the mean of its divisors is an integer number (10607400).

Almost surely, 2^120011721 is an apocalyptic number.

It is an amenable number.

120011721 is a deficient number, since it is larger than the sum of its proper divisors (49706679).

120011721 is a wasteful number, since it uses less digits than its factorization.

120011721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 120011721 is about 10954.9861250483. The cubic root of 120011721 is about 493.2584734942.

Adding to 120011721 its reverse (127110021), we get a palindrome (247121742).

It can be divided in two parts, 1200 and 11721, that added together give a palindrome (12921).

The spelling of 120011721 in words is "one hundred twenty million, eleven thousand, seven hundred twenty-one".