21105131059 has 2 divisors, whose sum is σ = 21105131060. Its totient is φ = 21105131058.

The previous prime is 21105131051. The next prime is 21105131137. The reversal of 21105131059 is 95013150112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21105131059 - 2³ = 21105131051 is a prime.

It is a super-2 number, since 2×21105131059² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21105131051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552565529 + 10552565530.

It is an arithmetic number, because the mean of its divisors is an integer number (10552565530).

Almost surely, 2^21105131059 is an apocalyptic number.

21105131059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21105131059 is an equidigital number, since it uses as much as digits as its factorization.

21105131059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 28.

The spelling of 21105131059 in words is "twenty-one billion, one hundred five million, one hundred thirty-one thousand, fifty-nine".