21340431296927 has 2 divisors, whose sum is σ = 21340431296928. Its totient is φ = 21340431296926.

The previous prime is 21340431296897. The next prime is 21340431296983. The reversal of 21340431296927 is 72969213404312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21340431296927 - 2²² = 21340427102623 is a prime.

It is a super-2 number, since 2×21340431296927² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21340431295927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670215648463 + 10670215648464.

It is an arithmetic number, because the mean of its divisors is an integer number (10670215648464).

Almost surely, 2^{21340431296927} is an apocalyptic number.

21340431296927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340431296927 is an equidigital number, since it uses as much as digits as its factorization.

21340431296927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 21340431296927 in words is "twenty-one trillion, three hundred forty billion, four hundred thirty-one million, two hundred ninety-six thousand, nine hundred twenty-seven".