21111530383 has 2 divisors, whose sum is σ = 21111530384. Its totient is φ = 21111530382.

The previous prime is 21111530261. The next prime is 21111530387. The reversal of 21111530383 is 38303511112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111530383 - 2⁹ = 21111529871 is a prime.

It is a super-2 number, since 2×21111530383² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111530387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555765191 + 10555765192.

It is an arithmetic number, because the mean of its divisors is an integer number (10555765192).

Almost surely, 2^21111530383 is an apocalyptic number.

21111530383 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111530383 is an equidigital number, since it uses as much as digits as its factorization.

21111530383 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 21111530383 in words is "twenty-one billion, one hundred eleven million, five hundred thirty thousand, three hundred eighty-three".