21504100223532 has 96 divisors (see below), whose sum is σ = 54066927882240. Its totient is φ = 6632731607040.

The previous prime is 21504100223503. The next prime is 21504100223537. The reversal of 21504100223532 is 23532200140512.

It is a self number, because there is not a number n which added to its sum of digits gives 21504100223532.

It is not an unprimeable number, because it can be changed into a prime (21504100223537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22539748 + ... + 23474420.

It is an arithmetic number, because the mean of its divisors is an integer number (563197165440).

Almost surely, 2^{21504100223532} 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 21504100223532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27033463941120).

21504100223532 is an abundant number, since it is smaller than the sum of its proper divisors (32562827658708).

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

21504100223532 is a wasteful number, since it uses less digits than its factorization.

21504100223532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937423 (or 937421 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21504100223532 in words is "twenty-one trillion, five hundred four billion, one hundred million, two hundred twenty-three thousand, five hundred thirty-two".