21006590012 has 24 divisors (see below), whose sum is σ = 37779873600. Its totient is φ = 10212713280.

The previous prime is 21006589993. The next prime is 21006590021. The reversal of 21006590012 is 21009560012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183437 + ... + 275067.

It is an arithmetic number, because the mean of its divisors is an integer number (1574161400).

Almost surely, 2^21006590012 is an apocalyptic number.

It is an amenable number.

21006590012 is a deficient number, since it is larger than the sum of its proper divisors (16773283588).

21006590012 is a wasteful number, since it uses less digits than its factorization.

21006590012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93221 (or 93219 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The spelling of 21006590012 in words is "twenty-one billion, six million, five hundred ninety thousand, twelve".