21015286316801 has 64 divisors (see below), whose sum is σ = 25936399019520. Its totient is φ = 16618673111040.

The previous prime is 21015286316797. The next prime is 21015286316833. The reversal of 21015286316801 is 10861368251012.

It is not a de Polignac number, because 21015286316801 - 2² = 21015286316797 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21015286319801) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3206968541 + ... + 3206975093.

It is an arithmetic number, because the mean of its divisors is an integer number (405256234680).

Almost surely, 2^{21015286316801} is an apocalyptic number.

It is an amenable number.

21015286316801 is a deficient number, since it is larger than the sum of its proper divisors (4921112702719).

21015286316801 is a wasteful number, since it uses less digits than its factorization.

21015286316801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8554.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 21015286316801 in words is "twenty-one trillion, fifteen billion, two hundred eighty-six million, three hundred sixteen thousand, eight hundred one".