21224512120504 has 128 divisors (see below), whose sum is σ = 50803292897280. Its totient is φ = 8071620681600.

The previous prime is 21224512120481. The next prime is 21224512120523. The reversal of 21224512120504 is 40502121542212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39758217 + ... + 40288519.

It is an arithmetic number, because the mean of its divisors is an integer number (396900725760).

Almost surely, 2^{21224512120504} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21224512120504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25401646448640).

21224512120504 is an abundant number, since it is smaller than the sum of its proper divisors (29578780776776).

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

21224512120504 is a wasteful number, since it uses less digits than its factorization.

21224512120504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531881 (or 531877 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 21224512120504 its reverse (40502121542212), we get a palindrome (61726633662716).

The spelling of 21224512120504 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred twelve million, one hundred twenty thousand, five hundred four".