21340400404313 has 8 divisors (see below), whose sum is σ = 21387398290440. Its totient is φ = 21293403834240.

The previous prime is 21340400404291. The next prime is 21340400404327. The reversal of 21340400404313 is 31340400404312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15074054731024 + 6266345673289 = 3882532^2 + 2503267^2 .

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 21340400404313 - 2²² = 21340396210009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21340400404363) 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, 36723683 + ... + 37300263.

It is an arithmetic number, because the mean of its divisors is an integer number (2673424786305).

Almost surely, 2^{21340400404313} is an apocalyptic number.

It is an amenable number.

21340400404313 is a deficient number, since it is larger than the sum of its proper divisors (46997886127).

21340400404313 is an equidigital number, since it uses as much as digits as its factorization.

21340400404313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658027.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21340400404313 its reverse (31340400404312), we get a palindrome (52680800808625).

Subtracting 21340400404313 from its reverse (31340400404312), we obtain a palindrome (9999999999999).

The spelling of 21340400404313 in words is "twenty-one trillion, three hundred forty billion, four hundred million, four hundred four thousand, three hundred thirteen".