2121351340 has 24 divisors (see below), whose sum is σ = 4575240432. Its totient is φ = 825606720.

The previous prime is 2121351319. The next prime is 2121351361. The reversal of 2121351340 is 431531212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2121351319) and next prime (2121351361).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432606 + ... + 1434085.

It is an arithmetic number, because the mean of its divisors is an integer number (190635018).

Almost surely, 2^2121351340 is an apocalyptic number.

2121351340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121351340 is an abundant number, since it is smaller than the sum of its proper divisors (2453889092).

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

2121351340 is a wasteful number, since it uses less digits than its factorization.

2121351340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866737 (or 2866735 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2121351340 is about 46058.1300098039. The cubic root of 2121351340 is about 1284.9045516471.

Adding to 2121351340 its reverse (431531212), we get a palindrome (2552882552).

The spelling of 2121351340 in words is "two billion, one hundred twenty-one million, three hundred fifty-one thousand, three hundred forty".