21525663111356 has 6 divisors (see below), whose sum is σ = 37669910444880. Its totient is φ = 10762831555676.

The previous prime is 21525663111347. The next prime is 21525663111391. The reversal of 21525663111356 is 65311136652512.

It is a self number, because there is not a number n which added to its sum of digits gives 21525663111356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2690707888916 + ... + 2690707888923.

It is an arithmetic number, because the mean of its divisors is an integer number (6278318407480).

Almost surely, 2^{21525663111356} is an apocalyptic number.

It is an amenable number.

21525663111356 is a deficient number, since it is larger than the sum of its proper divisors (16144247333524).

21525663111356 is a wasteful number, since it uses less digits than its factorization.

21525663111356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381415777843 (or 5381415777841 counting only the distinct ones).

The product of its digits is 972000, while the sum is 47.

Adding to 21525663111356 its reverse (65311136652512), we get a palindrome (86836799763868).

The spelling of 21525663111356 in words is "twenty-one trillion, five hundred twenty-five billion, six hundred sixty-three million, one hundred eleven thousand, three hundred fifty-six".