21385269403 has 2 divisors, whose sum is σ = 21385269404. Its totient is φ = 21385269402.

The previous prime is 21385269379. The next prime is 21385269413. The reversal of 21385269403 is 30496258312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21385269403 - 2¹⁷ = 21385138331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21385269403.

It is not a weakly prime, because it can be changed into another prime (21385269413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10692634701 + 10692634702.

It is an arithmetic number, because the mean of its divisors is an integer number (10692634702).

Almost surely, 2^21385269403 is an apocalyptic number.

21385269403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21385269403 is an equidigital number, since it uses as much as digits as its factorization.

21385269403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 21385269403 in words is "twenty-one billion, three hundred eighty-five million, two hundred sixty-nine thousand, four hundred three".