21140444423 has 8 divisors (see below), whose sum is σ = 24165580800. Its totient is φ = 18116576280.

The previous prime is 21140444419. The next prime is 21140444453. The reversal of 21140444423 is 32444404112.

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

It is a cyclic number.

It is not a de Polignac number, because 21140444423 - 2² = 21140444419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140444453) 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, 281063 + ... + 348248.

It is an arithmetic number, because the mean of its divisors is an integer number (3020697600).

Almost surely, 2^21140444423 is an apocalyptic number.

21140444423 is a deficient number, since it is larger than the sum of its proper divisors (3025136377).

21140444423 is an equidigital number, since it uses as much as digits as its factorization.

21140444423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634117.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21140444423 its reverse (32444404112), we get a palindrome (53584848535).

The spelling of 21140444423 in words is "twenty-one billion, one hundred forty million, four hundred forty-four thousand, four hundred twenty-three".