21006623013 has 8 divisors (see below), whose sum is σ = 28009562400. Its totient is φ = 14004049488.

The previous prime is 21006622997. The next prime is 21006623021. The reversal of 21006623013 is 31032660012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21006623013 - 2⁴ = 21006622997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21006623023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99423 + ... + 227811.

It is an arithmetic number, because the mean of its divisors is an integer number (3501195300).

Almost surely, 2^21006623013 is an apocalyptic number.

It is an amenable number.

21006623013 is a deficient number, since it is larger than the sum of its proper divisors (7002939387).

21006623013 is a wasteful number, since it uses less digits than its factorization.

21006623013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182931.

The product of its (nonzero) digits is 1296, while the sum is 24.

The spelling of 21006623013 in words is "twenty-one billion, six million, six hundred twenty-three thousand, thirteen".