21603272252212 has 144 divisors (see below), whose sum is σ = 45697835981952. Its totient is φ = 8903516509440.

The previous prime is 21603272252143. The next prime is 21603272252279. The reversal of 21603272252212 is 21225227230612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 438593778 + ... + 438643030.

It is an arithmetic number, because the mean of its divisors is an integer number (317346083208).

Almost surely, 2^{21603272252212} 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 21603272252212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22848917990976).

21603272252212 is an abundant number, since it is smaller than the sum of its proper divisors (24094563729740).

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

21603272252212 is a wasteful number, since it uses less digits than its factorization.

21603272252212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50118 (or 50109 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

Adding to 21603272252212 its reverse (21225227230612), we get a palindrome (42828499482824).

The spelling of 21603272252212 in words is "twenty-one trillion, six hundred three billion, two hundred seventy-two million, two hundred fifty-two thousand, two hundred twelve".