21011233321320 has 128 divisors (see below), whose sum is σ = 68811173568000. Its totient is φ = 5090140673280.

The previous prime is 21011233321319. The next prime is 21011233321363. The reversal of 21011233321320 is 2312333211012.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 31 ways as a sum of consecutive naturals, for example, 3529090 + ... + 7380849.

It is an arithmetic number, because the mean of its divisors is an integer number (537587293500).

Almost surely, 2^{21011233321320} is an apocalyptic number.

21011233321320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011233321320 is an abundant number, since it is smaller than the sum of its proper divisors (47799940246680).

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

21011233321320 is a wasteful number, since it uses less digits than its factorization.

21011233321320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10911423 (or 10911419 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21011233321320 its reverse (2312333211012), we get a palindrome (23323566532332).

The spelling of 21011233321320 in words is "twenty-one trillion, eleven billion, two hundred thirty-three million, three hundred twenty-one thousand, three hundred twenty".