2121091326 has 64 divisors (see below), whose sum is σ = 5207846400. Its totient is φ = 636501888.

The previous prime is 2121091289. The next prime is 2121091327. The reversal of 2121091326 is 6231901212.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 2121091326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121091327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29116 + ... + 71343.

It is an arithmetic number, because the mean of its divisors is an integer number (81372600).

Almost surely, 2^2121091326 is an apocalyptic number.

2121091326 is an abundant number, since it is smaller than the sum of its proper divisors (3086755074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121091326 is a wasteful number, since it uses less digits than its factorization.

2121091326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100510 (or 100504 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 2121091326 is about 46055.3072511736. The cubic root of 2121091326 is about 1284.8520525919.

Adding to 2121091326 its reverse (6231901212), we get a palindrome (8352992538).

The spelling of 2121091326 in words is "two billion, one hundred twenty-one million, ninety-one thousand, three hundred twenty-six".