21313143140 has 24 divisors (see below), whose sum is σ = 44784108600. Its totient is φ = 8520208128.

The previous prime is 21313143073. The next prime is 21313143143. The reversal of 21313143140 is 4134131312.

It can be written as a sum of positive squares in 4 ways, for example, as 708837376 + 20604305764 = 26624^2 + 143542^2 .

It is a super-2 number, since 2×21313143140² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21313143143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280865 + ... + 348584.

It is an arithmetic number, because the mean of its divisors is an integer number (1866004525).

Almost surely, 2^21313143140 is an apocalyptic number.

21313143140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313143140 is an abundant number, since it is smaller than the sum of its proper divisors (23470965460).

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

21313143140 is a wasteful number, since it uses less digits than its factorization.

21313143140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631151 (or 631149 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21313143140 its reverse (4134131312), we get a palindrome (25447274452).

The spelling of 21313143140 in words is "twenty-one billion, three hundred thirteen million, one hundred forty-three thousand, one hundred forty".