21033265680 has 960 divisors, whose sum is σ = 89341781760. Its totient is φ = 4528742400.

The previous prime is 21033265679. The next prime is 21033265697. The reversal of 21033265680 is 8656233012.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 160559215 + ... + 160559345.

It is an arithmetic number, because the mean of its divisors is an integer number (93064356).

Almost surely, 2^21033265680 is an apocalyptic number.

21033265680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21033265680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44670890880).

21033265680 is an abundant number, since it is smaller than the sum of its proper divisors (68308516080).

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

21033265680 is a wasteful number, since it uses less digits than its factorization.

21033265680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 21033265680 its reverse (8656233012), we get a palindrome (29689498692).

The spelling of 21033265680 in words is "twenty-one billion, thirty-three million, two hundred sixty-five thousand, six hundred eighty".