21431066013403 has 2 divisors, whose sum is σ = 21431066013404. Its totient is φ = 21431066013402.

The previous prime is 21431066013359. The next prime is 21431066013463. The reversal of 21431066013403 is 30431066013412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21431066013403 is a prime.

It is not a weakly prime, because it can be changed into another prime (21431066013463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715533006701 + 10715533006702.

It is an arithmetic number, because the mean of its divisors is an integer number (10715533006702).

Almost surely, 2^{21431066013403} is an apocalyptic number.

21431066013403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21431066013403 is an equidigital number, since it uses as much as digits as its factorization.

21431066013403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

Subtracting 21431066013403 from its reverse (30431066013412), we obtain a palindrome (9000000000009).

The spelling of 21431066013403 in words is "twenty-one trillion, four hundred thirty-one billion, sixty-six million, thirteen thousand, four hundred three".