21322104403421 has 8 divisors (see below), whose sum is σ = 21362737482840. Its totient is φ = 21281509896768.

The previous prime is 21322104403387. The next prime is 21322104403513. The reversal of 21322104403421 is 12430440122312.

It can be written as a sum of positive squares in 4 ways, for example, as 1660515732100 + 19661588671321 = 1288610^2 + 4434139^2 .

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 21322104403421 - 2²⁶ = 21322037294557 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 (21322104402421) 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, 8536466 + ... + 10747811.

It is an arithmetic number, because the mean of its divisors is an integer number (2670342185355).

Almost surely, 2^{21322104403421} is an apocalyptic number.

It is an amenable number.

21322104403421 is a deficient number, since it is larger than the sum of its proper divisors (40633079419).

21322104403421 is a wasteful number, since it uses less digits than its factorization.

21322104403421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19286383.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21322104403421 its reverse (12430440122312), we get a palindrome (33752544525733).

The spelling of 21322104403421 in words is "twenty-one trillion, three hundred twenty-two billion, one hundred four million, four hundred three thousand, four hundred twenty-one".