21120331033 has 8 divisors (see below), whose sum is σ = 21874998600. Its totient is φ = 20367422208.

The previous prime is 21120330989. The next prime is 21120331061. The reversal of 21120331033 is 33013302112.

It can be written as a sum of positive squares in 4 ways, for example, as 6880204809 + 14240126224 = 82947^2 + 119332^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120331033 is a prime.

It is a super-3 number, since 3×21120331033³ (a number of 32 digits) contains 333 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 21120331033.

It is not an unprimeable number, because it can be changed into a prime (21120331333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415216 + ... + 463297.

It is an arithmetic number, because the mean of its divisors is an integer number (2734374825).

Almost surely, 2^21120331033 is an apocalyptic number.

It is an amenable number.

21120331033 is a deficient number, since it is larger than the sum of its proper divisors (754667567).

21120331033 is an equidigital number, since it uses as much as digits as its factorization.

21120331033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879371.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21120331033 its reverse (33013302112), we get a palindrome (54133633145).

The spelling of 21120331033 in words is "twenty-one billion, one hundred twenty million, three hundred thirty-one thousand, thirty-three".