21033320322331 has 4 divisors (see below), whose sum is σ = 21033601670200. Its totient is φ = 21033038974464.

The previous prime is 21033320322281. The next prime is 21033320322341. The reversal of 21033320322331 is 13322302333012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033320322331 is a prime.

It is a super-2 number, since 2×21033320322331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21033320322331.

It is not an unprimeable number, because it can be changed into a prime (21033320322341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140561766 + ... + 140711323.

It is an arithmetic number, because the mean of its divisors is an integer number (5258400417550).

Almost surely, 2^{21033320322331} is an apocalyptic number.

21033320322331 is a deficient number, since it is larger than the sum of its proper divisors (281347869).

21033320322331 is an equidigital number, since it uses as much as digits as its factorization.

21033320322331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281347868.

The product of its (nonzero) digits is 11664, while the sum is 28.

Adding to 21033320322331 its reverse (13322302333012), we get a palindrome (34355622655343).

The spelling of 21033320322331 in words is "twenty-one trillion, thirty-three billion, three hundred twenty million, three hundred twenty-two thousand, three hundred thirty-one".