2121321340 has 12 divisors (see below), whose sum is σ = 4454774856. Its totient is φ = 848528528.

The previous prime is 2121321317. The next prime is 2121321347. The reversal of 2121321340 is 431231212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121321347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53033014 + ... + 53033053.

It is an arithmetic number, because the mean of its divisors is an integer number (371231238).

Almost surely, 2^2121321340 is an apocalyptic number.

2121321340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121321340 is an abundant number, since it is smaller than the sum of its proper divisors (2333453516).

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

2121321340 is a wasteful number, since it uses less digits than its factorization.

2121321340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106066076 (or 106066074 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2121321340 is about 46057.8043332506. The cubic root of 2121321340 is about 1284.8984946089.

Adding to 2121321340 its reverse (431231212), we get a palindrome (2552552552).

The spelling of 2121321340 in words is "two billion, one hundred twenty-one million, three hundred twenty-one thousand, three hundred forty".