21330244031 has 8 divisors (see below), whose sum is σ = 21822937920. Its totient is φ = 20843117568.

The previous prime is 21330244009. The next prime is 21330244051. The reversal of 21330244031 is 13044203312.

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

It is a cyclic number.

It is not a de Polignac number, because 21330244031 - 2⁶ = 21330243967 is a prime.

It is a super-2 number, since 2×21330244031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21330243988 and 21330244006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330244051) 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, 1384106 + ... + 1399431.

It is an arithmetic number, because the mean of its divisors is an integer number (2727867240).

Almost surely, 2^21330244031 is an apocalyptic number.

21330244031 is a deficient number, since it is larger than the sum of its proper divisors (492693889).

21330244031 is an equidigital number, since it uses as much as digits as its factorization.

21330244031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783713.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21330244031 its reverse (13044203312), we get a palindrome (34374447343).

The spelling of 21330244031 in words is "twenty-one billion, three hundred thirty million, two hundred forty-four thousand, thirty-one".