21726831403 has 2 divisors, whose sum is σ = 21726831404. Its totient is φ = 21726831402.

The previous prime is 21726831391. The next prime is 21726831421. The reversal of 21726831403 is 30413862712.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21726831403 is a prime.

It is not a weakly prime, because it can be changed into another prime (21726831463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10863415701 + 10863415702.

It is an arithmetic number, because the mean of its divisors is an integer number (10863415702).

Almost surely, 2^21726831403 is an apocalyptic number.

21726831403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21726831403 is an equidigital number, since it uses as much as digits as its factorization.

21726831403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 21726831403 in words is "twenty-one billion, seven hundred twenty-six million, eight hundred thirty-one thousand, four hundred three".