120120002021 has 4 divisors (see below), whose sum is σ = 122089182444. Its totient is φ = 118150821600.

The previous prime is 120120001997. The next prime is 120120002029. The reversal of 120120002021 is 120200021021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120200021021 = 1531 ⋅78510791.

It can be written as a sum of positive squares in 2 ways, for example, as 56530293121 + 63589708900 = 237761^2 + 252170^2 .

It is a cyclic number.

It is not a de Polignac number, because 120120002021 - 2¹⁴ = 120119985637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120120001993 and 120120002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120120002029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984590120 + ... + 984590241.

It is an arithmetic number, because the mean of its divisors is an integer number (30522295611).

Almost surely, 2^120120002021 is an apocalyptic number.

It is an amenable number.

120120002021 is a deficient number, since it is larger than the sum of its proper divisors (1969180423).

120120002021 is an equidigital number, since it uses as much as digits as its factorization.

120120002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969180422.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 120120002021 its reverse (120200021021), we get a palindrome (240320023042).

The spelling of 120120002021 in words is "one hundred twenty billion, one hundred twenty million, two thousand, twenty-one".