21301381903 has 2 divisors, whose sum is σ = 21301381904. Its totient is φ = 21301381902.

The previous prime is 21301381879. The next prime is 21301381931. The reversal of 21301381903 is 30918310312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301381903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21301381993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650690951 + 10650690952.

It is an arithmetic number, because the mean of its divisors is an integer number (10650690952).

Almost surely, 2^21301381903 is an apocalyptic number.

21301381903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301381903 is an equidigital number, since it uses as much as digits as its factorization.

21301381903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 21301381903 in words is "twenty-one billion, three hundred one million, three hundred eighty-one thousand, nine hundred three".