120721620 has 24 divisors (see below), whose sum is σ = 338020704. Its totient is φ = 32192416.

The previous prime is 120721613. The next prime is 120721621. The reversal of 120721620 is 26127021.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005954 + ... + 1006073.

It is an arithmetic number, because the mean of its divisors is an integer number (14084196).

Almost surely, 2^120721620 is an apocalyptic number.

120721620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120721620 is an abundant number, since it is smaller than the sum of its proper divisors (217299084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

120721620 is a wasteful number, since it uses less digits than its factorization.

120721620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012039 (or 2012037 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 120721620 is about 10987.3390773199. The cubic root of 120721620 is about 494.2291440233.

Adding to 120721620 its reverse (26127021), we get a palindrome (146848641).

The spelling of 120721620 in words is "one hundred twenty million, seven hundred twenty-one thousand, six hundred twenty".