21064443403 has 2 divisors, whose sum is σ = 21064443404. Its totient is φ = 21064443402.

The previous prime is 21064443391. The next prime is 21064443427. The reversal of 21064443403 is 30434446012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21064443403 - 2¹⁷ = 21064312331 is a prime.

It is not a weakly prime, because it can be changed into another prime (21064443443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532221701 + 10532221702.

It is an arithmetic number, because the mean of its divisors is an integer number (10532221702).

Almost surely, 2^21064443403 is an apocalyptic number.

21064443403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21064443403 is an equidigital number, since it uses as much as digits as its factorization.

21064443403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 21064443403 its reverse (30434446012), we get a palindrome (51498889415).

The spelling of 21064443403 in words is "twenty-one billion, sixty-four million, four hundred forty-three thousand, four hundred three".