21044310421 has 8 divisors (see below), whose sum is σ = 22452306624. Its totient is φ = 19655213760.

The previous prime is 21044310389. The next prime is 21044310431. The reversal of 21044310421 is 12401344012.

It is a happy number.

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 21044310421 - 2⁵ = 21044310389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21044310392 and 21044310401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044310431) 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, 4722585 + ... + 4727038.

It is an arithmetic number, because the mean of its divisors is an integer number (2806538328).

Almost surely, 2^21044310421 is an apocalyptic number.

It is an amenable number.

21044310421 is a deficient number, since it is larger than the sum of its proper divisors (1407996203).

21044310421 is a wasteful number, since it uses less digits than its factorization.

21044310421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9449771.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21044310421 its reverse (12401344012), we get a palindrome (33445654433).

The spelling of 21044310421 in words is "twenty-one billion, forty-four million, three hundred ten thousand, four hundred twenty-one".