120021221999 has 12 divisors (see below), whose sum is σ = 144766399824. Its totient is φ = 97460839872.

The previous prime is 120021221981. The next prime is 120021222001. The reversal of 120021221999 is 999122120021.

It is a happy number.

It is not a de Polignac number, because 120021221999 - 2⁸ = 120021221743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021221939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23745242 + ... + 23750295.

It is an arithmetic number, because the mean of its divisors is an integer number (12063866652).

Almost surely, 2^120021221999 is an apocalyptic number.

120021221999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

120021221999 is a deficient number, since it is larger than the sum of its proper divisors (24745177825).

120021221999 is an equidigital number, since it uses as much as digits as its factorization.

120021221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47495582 (or 47495563 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 120021221999 in words is "one hundred twenty billion, twenty-one million, two hundred twenty-one thousand, nine hundred ninety-nine".