21130011983 has 2 divisors, whose sum is σ = 21130011984. Its totient is φ = 21130011982.

The previous prime is 21130011919. The next prime is 21130012039. The reversal of 21130011983 is 38911003112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21130011983 - 2⁶ = 21130011919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21130011083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565005991 + 10565005992.

It is an arithmetic number, because the mean of its divisors is an integer number (10565005992).

Almost surely, 2^21130011983 is an apocalyptic number.

21130011983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130011983 is an equidigital number, since it uses as much as digits as its factorization.

21130011983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 21130011983 in words is "twenty-one billion, one hundred thirty million, eleven thousand, nine hundred eighty-three".