21426506130403 has 24 divisors (see below), whose sum is σ = 24518230536240. Its totient is φ = 18568153412160.

The previous prime is 21426506130361. The next prime is 21426506130413. The reversal of 21426506130403 is 30403160562412.

It is not a de Polignac number, because 21426506130403 - 2²¹ = 21426504033251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21426506130413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4578588 + ... + 7988521.

It is an arithmetic number, because the mean of its divisors is an integer number (1021592939010).

Almost surely, 2^{21426506130403} is an apocalyptic number.

21426506130403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21426506130403 is a deficient number, since it is larger than the sum of its proper divisors (3091724405837).

21426506130403 is a wasteful number, since it uses less digits than its factorization.

21426506130403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12567459 (or 12567436 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 21426506130403 its reverse (30403160562412), we get a palindrome (51829666692815).

The spelling of 21426506130403 in words is "twenty-one trillion, four hundred twenty-six billion, five hundred six million, one hundred thirty thousand, four hundred three".