120001120021 has 6 divisors (see below), whose sum is σ = 127475238530. Its totient is φ = 112942230336.

The previous prime is 120001120013. The next prime is 120001120033. The reversal of 120001120021 is 120021100021.

It can be written as a sum of positive squares in 3 ways, for example, as 65787120100 + 54213999921 = 256490^2 + 232839^2 .

It is not a de Polignac number, because 120001120021 - 2³ = 120001120013 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 (120001120121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207614106 + ... + 207614683.

Almost surely, 2^120001120021 is an apocalyptic number.

It is an amenable number.

120001120021 is a deficient number, since it is larger than the sum of its proper divisors (7474118509).

120001120021 is an equidigital number, since it uses as much as digits as its factorization.

120001120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415228823 (or 415228806 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 120001120021 its reverse (120021100021), we get a palindrome (240022220042).

The spelling of 120001120021 in words is "one hundred twenty billion, one million, one hundred twenty thousand, twenty-one".