120203111021 has 4 divisors (see below), whose sum is σ = 137374984032. Its totient is φ = 103031238012.

The previous prime is 120203111009. The next prime is 120203111081. The reversal of 120203111021 is 120111302021.

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: 120111302021 = 157639 ⋅761939.

It is a cyclic number.

It is not a de Polignac number, because 120203111021 - 2¹⁰ = 120203109997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120203110987 and 120203111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120203111081) 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, 8585936495 + ... + 8585936508.

It is an arithmetic number, because the mean of its divisors is an integer number (34343746008).

Almost surely, 2^120203111021 is an apocalyptic number.

It is an amenable number.

120203111021 is a deficient number, since it is larger than the sum of its proper divisors (17171873011).

120203111021 is an equidigital number, since it uses as much as digits as its factorization.

120203111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17171873010.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 120203111021 its reverse (120111302021), we get a palindrome (240314413042).

The spelling of 120203111021 in words is "one hundred twenty billion, two hundred three million, one hundred eleven thousand, twenty-one".