120728151221 has 8 divisors (see below), whose sum is σ = 124824609024. Its totient is φ = 116644318560.

The previous prime is 120728151211. The next prime is 120728151233. The reversal of 120728151221 is 122151827021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 120728151221 - 2¹⁴ = 120728134837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120728151211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3136835 + ... + 3175088.

It is an arithmetic number, because the mean of its divisors is an integer number (15603076128).

Almost surely, 2^120728151221 is an apocalyptic number.

It is an amenable number.

120728151221 is a deficient number, since it is larger than the sum of its proper divisors (4096457803).

120728151221 is an equidigital number, since it uses as much as digits as its factorization.

120728151221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6312571.

The product of its (nonzero) digits is 4480, while the sum is 32.

Adding to 120728151221 its reverse (122151827021), we get a palindrome (242879978242).

The spelling of 120728151221 in words is "one hundred twenty billion, seven hundred twenty-eight million, one hundred fifty-one thousand, two hundred twenty-one".