120721646 has 4 divisors (see below), whose sum is σ = 181082472. Its totient is φ = 60360822.

The previous prime is 120721637. The next prime is 120721673. The reversal of 120721646 is 646127021.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30180410 + ... + 30180413.

It is an arithmetic number, because the mean of its divisors is an integer number (45270618).

Almost surely, 2^120721646 is an apocalyptic number.

120721646 is a deficient number, since it is larger than the sum of its proper divisors (60360826).

120721646 is an equidigital number, since it uses as much as digits as its factorization.

120721646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60360825.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 120721646 is about 10987.3402604998. The cubic root of 120721646 is about 494.2291795043.

Adding to 120721646 its reverse (646127021), we get a palindrome (766848667).

The spelling of 120721646 in words is "one hundred twenty million, seven hundred twenty-one thousand, six hundred forty-six".