21102272576 has 168 divisors, whose sum is σ = 55452361536. Its totient is φ = 7863905280.

The previous prime is 21102272573. The next prime is 21102272591. The reversal of 21102272576 is 67527220112.

It is not an unprimeable number, because it can be changed into a prime (21102272573) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 780110 + ... + 806706.

Almost surely, 2^21102272576 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 21102272576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27726180768).

21102272576 is an abundant number, since it is smaller than the sum of its proper divisors (34350088960).

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

21102272576 is a wasteful number, since it uses less digits than its factorization.

21102272576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26657 (or 26640 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

Adding to 21102272576 its reverse (67527220112), we get a palindrome (88629492688).

The spelling of 21102272576 in words is "twenty-one billion, one hundred two million, two hundred seventy-two thousand, five hundred seventy-six".