2120403021 has 16 divisors (see below), whose sum is σ = 3246551040. Its totient is φ = 1217455920.

The previous prime is 2120402987. The next prime is 2120403031. The reversal of 2120403021 is 1203040212.

2120403021 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2120403021 - 2⁶ = 2120402957 is a prime.

It is a super-2 number, since 2×2120403021² = 8992217942931852882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120403031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1690285 + ... + 1691538.

It is an arithmetic number, because the mean of its divisors is an integer number (202909440).

Almost surely, 2^2120403021 is an apocalyptic number.

It is an amenable number.

2120403021 is a deficient number, since it is larger than the sum of its proper divisors (1126148019).

2120403021 is a wasteful number, since it uses less digits than its factorization.

2120403021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381856.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2120403021 is about 46047.8340532972. The cubic root of 2120403021 is about 1284.7130571985.

Adding to 2120403021 its reverse (1203040212), we get a palindrome (3323443233).

The spelling of 2120403021 in words is "two billion, one hundred twenty million, four hundred three thousand, twenty-one".