21112472472 has 256 divisors, whose sum is σ = 66155443200. Its totient is φ = 5466839040.

The previous prime is 21112472471. The next prime is 21112472509. The reversal of 21112472472 is 27427421112.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112472471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31184998 + ... + 31185674.

It is an arithmetic number, because the mean of its divisors is an integer number (258419700).

Almost surely, 2^21112472472 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 21112472472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33077721600).

21112472472 is an abundant number, since it is smaller than the sum of its proper divisors (45042970728).

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

21112472472 is a wasteful number, since it uses less digits than its factorization.

21112472472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 942 counting only the distinct ones).

The product of its digits is 12544, while the sum is 33.

Adding to 21112472472 its reverse (27427421112), we get a palindrome (48539893584).

The spelling of 21112472472 in words is "twenty-one billion, one hundred twelve million, four hundred seventy-two thousand, four hundred seventy-two".