21100961059 has 2 divisors, whose sum is σ = 21100961060. Its totient is φ = 21100961058.

The previous prime is 21100960963. The next prime is 21100961071. The reversal of 21100961059 is 95016900112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100961059 - 2¹⁵ = 21100928291 is a prime.

It is a super-2 number, since 2×21100961059² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21100911059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550480529 + 10550480530.

It is an arithmetic number, because the mean of its divisors is an integer number (10550480530).

Almost surely, 2^21100961059 is an apocalyptic number.

21100961059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100961059 is an equidigital number, since it uses as much as digits as its factorization.

21100961059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 34.

The spelling of 21100961059 in words is "twenty-one billion, one hundred million, nine hundred sixty-one thousand, fifty-nine".