21002325617811 has 16 divisors (see below), whose sum is σ = 28760101553664. Its totient is φ = 13623054261984.

The previous prime is 21002325617797. The next prime is 21002325617831. The reversal of 21002325617811 is 11871652320012.

It is not a de Polignac number, because 21002325617811 - 2¹⁰ = 21002325616787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21002325617811.

It is not an unprimeable number, because it can be changed into a prime (21002325617831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25071640 + ... + 25895786.

It is an arithmetic number, because the mean of its divisors is an integer number (1797506347104).

Almost surely, 2^{21002325617811} is an apocalyptic number.

21002325617811 is a deficient number, since it is larger than the sum of its proper divisors (7757775935853).

21002325617811 is a wasteful number, since it uses less digits than its factorization.

21002325617811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053770.

The product of its (nonzero) digits is 40320, while the sum is 39.

Adding to 21002325617811 its reverse (11871652320012), we get a palindrome (32873977937823).

The spelling of 21002325617811 in words is "twenty-one trillion, two billion, three hundred twenty-five million, six hundred seventeen thousand, eight hundred eleven".