21310003903 has 2 divisors, whose sum is σ = 21310003904. Its totient is φ = 21310003902.

The previous prime is 21310003843. The next prime is 21310003937. The reversal of 21310003903 is 30930001312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21310003903 - 2³³ = 12720069311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310003993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655001951 + 10655001952.

It is an arithmetic number, because the mean of its divisors is an integer number (10655001952).

Almost surely, 2^21310003903 is an apocalyptic number.

21310003903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310003903 is an equidigital number, since it uses as much as digits as its factorization.

21310003903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 22.

The spelling of 21310003903 in words is "twenty-one billion, three hundred ten million, three thousand, nine hundred three".