21140343020 has 48 divisors (see below), whose sum is σ = 45031563360. Its totient is φ = 8334982656.

The previous prime is 21140342929. The next prime is 21140343023. The reversal of 21140343020 is 2034304112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21140342983 and 21140343001.

It is not an unprimeable number, because it can be changed into a prime (21140343023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2920766 + ... + 2927994.

It is an arithmetic number, because the mean of its divisors is an integer number (938157570).

Almost surely, 2^21140343020 is an apocalyptic number.

21140343020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21140343020 is an abundant number, since it is smaller than the sum of its proper divisors (23891220340).

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

21140343020 is a wasteful number, since it uses less digits than its factorization.

21140343020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9314 (or 9312 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21140343020 its reverse (2034304112), we get a palindrome (23174647132).

It can be divided in two parts, 21 and 140343020, that added together give a palindrome (140343041).

The spelling of 21140343020 in words is "twenty-one billion, one hundred forty million, three hundred forty-three thousand, twenty".