120021002021 has 4 divisors (see below), whose sum is σ = 120242852844. Its totient is φ = 119799151200.

The previous prime is 120021001981. The next prime is 120021002039. The reversal of 120021002021 is 120200120021.

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: 120200120021 = 367 ⋅327520763.

It can be written as a sum of positive squares in 2 ways, for example, as 26638809796 + 93382192225 = 163214^2 + 305585^2 .

It is a cyclic number.

It is not a de Polignac number, because 120021002021 - 2⁶ = 120021001957 is a prime.

It is a super-2 number, since 2×120021002021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120021001993 and 120021002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021002821) 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, 110924600 + ... + 110925681.

It is an arithmetic number, because the mean of its divisors is an integer number (30060713211).

Almost surely, 2^120021002021 is an apocalyptic number.

It is an amenable number.

120021002021 is a deficient number, since it is larger than the sum of its proper divisors (221850823).

120021002021 is an equidigital number, since it uses as much as digits as its factorization.

120021002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221850822.

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

Adding to 120021002021 its reverse (120200120021), we get a palindrome (240221122042).

The spelling of 120021002021 in words is "one hundred twenty billion, twenty-one million, two thousand, twenty-one".