120202020021 has 4 divisors (see below), whose sum is σ = 160269360032. Its totient is φ = 80134680012.

The previous prime is 120202020019. The next prime is 120202020023. The reversal of 120202020021 is 120020202021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120020202021 = 3 ⋅40006734007.

It is an interprime number because it is at equal distance from previous prime (120202020019) and next prime (120202020023).

It is not a de Polignac number, because 120202020021 - 2¹ = 120202020019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120202019979 and 120202020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120202020023) 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, 20033670001 + ... + 20033670006.

It is an arithmetic number, because the mean of its divisors is an integer number (40067340008).

Almost surely, 2^120202020021 is an apocalyptic number.

It is an amenable number.

120202020021 is a deficient number, since it is larger than the sum of its proper divisors (40067340011).

120202020021 is an equidigital number, since it uses as much as digits as its factorization.

120202020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40067340010.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 120202020021 its reverse (120020202021), we get a palindrome (240222222042).

The spelling of 120202020021 in words is "one hundred twenty billion, two hundred two million, twenty thousand, twenty-one".