120021221987 has 8 divisors (see below), whose sum is σ = 125425445376. Its totient is φ = 114735772872.

The previous prime is 120021221981. The next prime is 120021222001. The reversal of 120021221987 is 789122120021.

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 120021221987 - 2¹² = 120021217891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120021221981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29691503 + ... + 29695544.

It is an arithmetic number, because the mean of its divisors is an integer number (15678180672).

Almost surely, 2^120021221987 is an apocalyptic number.

120021221987 is a deficient number, since it is larger than the sum of its proper divisors (5404223389).

120021221987 is an equidigital number, since it uses as much as digits as its factorization.

120021221987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59387137.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 120021221987 in words is "one hundred twenty billion, twenty-one million, two hundred twenty-one thousand, nine hundred eighty-seven".