21321022004413 has 4 divisors (see below), whose sum is σ = 21613090799068. Its totient is φ = 21028953209760.

The previous prime is 21321022004383. The next prime is 21321022004431. The reversal of 21321022004413 is 31440022012312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15981789184729 + 5339232819684 = 3997723^2 + 2310678^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321022004413 - 2¹⁷ = 21321021873341 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 (21321022004453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146034397218 + ... + 146034397363.

It is an arithmetic number, because the mean of its divisors is an integer number (5403272699767).

Almost surely, 2^{21321022004413} is an apocalyptic number.

It is an amenable number.

21321022004413 is a deficient number, since it is larger than the sum of its proper divisors (292068794655).

21321022004413 is an equidigital number, since it uses as much as digits as its factorization.

21321022004413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292068794654.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21321022004413 its reverse (31440022012312), we get a palindrome (52761044016725).

The spelling of 21321022004413 in words is "twenty-one trillion, three hundred twenty-one billion, twenty-two million, four thousand, four hundred thirteen".