21133245320 has 64 divisors (see below), whose sum is σ = 52301341440. Its totient is φ = 7684797120.

The previous prime is 21133245269. The next prime is 21133245361. The reversal of 21133245320 is 2354233112.

It is a happy number.

It is a super-3 number, since 3×21133245320³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21133245320.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145232 + ... + 251711.

It is an arithmetic number, because the mean of its divisors is an integer number (817208460).

Almost surely, 2^21133245320 is an apocalyptic number.

21133245320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21133245320 is an abundant number, since it is smaller than the sum of its proper divisors (31168096120).

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

21133245320 is a wasteful number, since it uses less digits than its factorization.

21133245320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396987 (or 396961 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21133245320 its reverse (2354233112), we get a palindrome (23487478432).

It can be divided in two parts, 211332 and 45320, that added together give a palindrome (256652).

The spelling of 21133245320 in words is "twenty-one billion, one hundred thirty-three million, two hundred forty-five thousand, three hundred twenty".