21223247076 has 240 divisors, whose sum is σ = 60020452800. Its totient is φ = 6519149568.

The previous prime is 21223247051. The next prime is 21223247119. The reversal of 21223247076 is 67074232212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21223247076.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 37298920 + ... + 37299488.

It is an arithmetic number, because the mean of its divisors is an integer number (250085220).

Almost surely, 2^21223247076 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 21223247076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30010226400).

21223247076 is an abundant number, since it is smaller than the sum of its proper divisors (38797205724).

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

21223247076 is a wasteful number, since it uses less digits than its factorization.

21223247076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

Adding to 21223247076 its reverse (67074232212), we get a palindrome (88297479288).

The spelling of 21223247076 in words is "twenty-one billion, two hundred twenty-three million, two hundred forty-seven thousand, seventy-six".