21400044043 has 8 divisors (see below), whose sum is σ = 24492592640. Its totient is φ = 18316345320.

The previous prime is 21400044019. The next prime is 21400044059. The reversal of 21400044043 is 34044000412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21400044043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21400047043) 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, 2207283 + ... + 2216956.

It is an arithmetic number, because the mean of its divisors is an integer number (3061574080).

Almost surely, 2^21400044043 is an apocalyptic number.

21400044043 is a deficient number, since it is larger than the sum of its proper divisors (3092548597).

21400044043 is an equidigital number, since it uses as much as digits as its factorization.

21400044043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424937.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21400044043 its reverse (34044000412), we get a palindrome (55444044455).

The spelling of 21400044043 in words is "twenty-one billion, four hundred million, forty-four thousand, forty-three".