21012011093 has 2 divisors, whose sum is σ = 21012011094. Its totient is φ = 21012011092.

The previous prime is 21012011071. The next prime is 21012011143. The reversal of 21012011093 is 39011021012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18069274084 + 2942737009 = 134422^2 + 54247^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012011093 - 2²² = 21007816789 is a prime.

It is a super-2 number, since 2×21012011093² (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 (21012011893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506005546 + 10506005547.

It is an arithmetic number, because the mean of its divisors is an integer number (10506005547).

Almost surely, 2^21012011093 is an apocalyptic number.

It is an amenable number.

21012011093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012011093 is an equidigital number, since it uses as much as digits as its factorization.

21012011093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 21012011093 in words is "twenty-one billion, twelve million, eleven thousand, ninety-three".