21010020093 has 12 divisors (see below), whose sum is σ = 30364908028. Its totient is φ = 13998787200.

The previous prime is 21010020091. The next prime is 21010020113. The reversal of 21010020093 is 39002001012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3890391129 + 17119628964 = 62373^2 + 130842^2 .

It is not a de Polignac number, because 21010020093 - 2¹ = 21010020091 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010020091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 640858 + ... + 672843.

Almost surely, 2^21010020093 is an apocalyptic number.

It is an amenable number.

21010020093 is a deficient number, since it is larger than the sum of its proper divisors (9354887935).

21010020093 is a wasteful number, since it uses less digits than its factorization.

21010020093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315484 (or 1315481 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The spelling of 21010020093 in words is "twenty-one billion, ten million, twenty thousand, ninety-three".