2126091021 has 16 divisors (see below), whose sum is σ = 2846610624. Its totient is φ = 1411496064.

The previous prime is 2126091001. The next prime is 2126091031. The reversal of 2126091021 is 1201906212.

It is not a de Polignac number, because 2126091021 - 2¹⁰ = 2126089997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2126090982 and 2126091000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2126091001) 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, 1019646 + ... + 1021728.

It is an arithmetic number, because the mean of its divisors is an integer number (177913164).

Almost surely, 2^2126091021 is an apocalyptic number.

It is an amenable number.

2126091021 is a deficient number, since it is larger than the sum of its proper divisors (720519603).

2126091021 is a wasteful number, since it uses less digits than its factorization.

2126091021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3340.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 2126091021 is about 46109.5545521750. The cubic root of 2126091021 is about 1285.8607829562.

Adding to 2126091021 its reverse (1201906212), we get a palindrome (3327997233).

The spelling of 2126091021 in words is "two billion, one hundred twenty-six million, ninety-one thousand, twenty-one".