21504254210112 has 56 divisors (see below), whose sum is σ = 56959403679136. Its totient is φ = 7160181608448.

The previous prime is 21504254210099. The next prime is 21504254210113. The reversal of 21504254210112 is 21101245240512.

It is a self number, because there is not a number n which added to its sum of digits gives 21504254210112.

It is not an unprimeable number, because it can be changed into a prime (21504254210113) 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, 61568593 + ... + 61916880.

It is an arithmetic number, because the mean of its divisors is an integer number (1017132208556).

Almost surely, 2^{21504254210112} is an apocalyptic number.

It is an amenable number.

21504254210112 is an abundant number, since it is smaller than the sum of its proper divisors (35455149469024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21504254210112 is a wasteful number, since it uses less digits than its factorization.

21504254210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123486395 (or 123486385 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

Adding to 21504254210112 its reverse (21101245240512), we get a palindrome (42605499450624).

The spelling of 21504254210112 in words is "twenty-one trillion, five hundred four billion, two hundred fifty-four million, two hundred ten thousand, one hundred twelve".