21330330131 has 16 divisors (see below), whose sum is σ = 23357494368. Its totient is φ = 19317984000.

The previous prime is 21330330113. The next prime is 21330330139. The reversal of 21330330131 is 13103303312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330330131 is a prime.

It is a super-2 number, since 2×21330330131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21330330139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3520901 + ... + 3526953.

It is an arithmetic number, because the mean of its divisors is an integer number (1459843398).

Almost surely, 2^21330330131 is an apocalyptic number.

21330330131 is a deficient number, since it is larger than the sum of its proper divisors (2027164237).

21330330131 is a wasteful number, since it uses less digits than its factorization.

21330330131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7222.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 21330330131 its reverse (13103303312), we get a palindrome (34433633443).

The spelling of 21330330131 in words is "twenty-one billion, three hundred thirty million, three hundred thirty thousand, one hundred thirty-one".