21115351583 has 2 divisors, whose sum is σ = 21115351584. Its totient is φ = 21115351582.

The previous prime is 21115351571. The next prime is 21115351591. The reversal of 21115351583 is 38515351112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21115351583 - 2¹⁶ = 21115286047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21115351513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557675791 + 10557675792.

It is an arithmetic number, because the mean of its divisors is an integer number (10557675792).

Almost surely, 2^21115351583 is an apocalyptic number.

21115351583 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115351583 is an equidigital number, since it uses as much as digits as its factorization.

21115351583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 35.

The spelling of 21115351583 in words is "twenty-one billion, one hundred fifteen million, three hundred fifty-one thousand, five hundred eighty-three".