120721601 has 24 divisors (see below), whose sum is σ = 162995904. Its totient is φ = 86823360.

The previous prime is 120721583. The next prime is 120721613. The reversal of 120721601 is 106127021.

It is not a de Polignac number, because 120721601 - 2¹⁰ = 120720577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120721621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8375 + ... + 17651.

It is an arithmetic number, because the mean of its divisors is an integer number (6791496).

Almost surely, 2^120721601 is an apocalyptic number.

120721601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

120721601 is a deficient number, since it is larger than the sum of its proper divisors (42274303).

120721601 is a wasteful number, since it uses less digits than its factorization.

120721601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9321 (or 9308 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 120721601 is about 10987.3382126883. The cubic root of 120721601 is about 494.2291180949.

Adding to 120721601 its reverse (106127021), we get a palindrome (226848622).

The spelling of 120721601 in words is "one hundred twenty million, seven hundred twenty-one thousand, six hundred one".