21010033320 has 32 divisors (see below), whose sum is σ = 63030100320. Its totient is φ = 5602675520.

The previous prime is 21010033301. The next prime is 21010033391. The reversal of 21010033320 is 2333001012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21010033320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87541686 + ... + 87541925.

It is an arithmetic number, because the mean of its divisors is an integer number (1969690635).

Almost surely, 2^21010033320 is an apocalyptic number.

21010033320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010033320 is an abundant number, since it is smaller than the sum of its proper divisors (42020067000).

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

21010033320 is a wasteful number, since it uses less digits than its factorization.

21010033320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175083625 (or 175083621 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21010033320 its reverse (2333001012), we get a palindrome (23343034332).

The spelling of 21010033320 in words is "twenty-one billion, ten million, thirty-three thousand, three hundred twenty".