21134343140 has 24 divisors (see below), whose sum is σ = 44487559032. Its totient is φ = 8433653760.

The previous prime is 21134343089. The next prime is 21134343143. The reversal of 21134343140 is 4134343112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2306112484 + 18828230656 = 48022^2 + 137216^2 .

It is not an unprimeable number, because it can be changed into a prime (21134343143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246589 + ... + 1263428.

It is an arithmetic number, because the mean of its divisors is an integer number (1853648293).

Almost surely, 2^21134343140 is an apocalyptic number.

21134343140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21134343140 is an abundant number, since it is smaller than the sum of its proper divisors (23353215892).

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

21134343140 is a wasteful number, since it uses less digits than its factorization.

21134343140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510447 (or 2510445 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21134343140 its reverse (4134343112), we get a palindrome (25268686252).

The spelling of 21134343140 in words is "twenty-one billion, one hundred thirty-four million, three hundred forty-three thousand, one hundred forty".