21140414443 has 4 divisors (see below), whose sum is σ = 21822363328. Its totient is φ = 20458465560.

The previous prime is 21140414437. The next prime is 21140414453. The reversal of 21140414443 is 34441404112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21140414443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140414453) 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, 340974396 + ... + 340974457.

It is an arithmetic number, because the mean of its divisors is an integer number (5455590832).

Almost surely, 2^21140414443 is an apocalyptic number.

21140414443 is a deficient number, since it is larger than the sum of its proper divisors (681948885).

21140414443 is an equidigital number, since it uses as much as digits as its factorization.

21140414443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681948884.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21140414443 its reverse (34441404112), we get a palindrome (55581818555).

The spelling of 21140414443 in words is "twenty-one billion, one hundred forty million, four hundred fourteen thousand, four hundred forty-three".