13431030021 has 24 divisors (see below), whose sum is σ = 20317040640. Its totient is φ = 8533758816.

The previous prime is 13431030017. The next prime is 13431030073. The reversal of 13431030021 is 12003013431.

13431030021 is a `hidden beast` number, since 1 + 34 + 310 + 300 + 21 = 666.

It is not a de Polignac number, because 13431030021 - 2² = 13431030017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13431029976 and 13431030003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13431030001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59781 + ... + 174458.

It is an arithmetic number, because the mean of its divisors is an integer number (846543360).

Almost surely, 2^13431030021 is an apocalyptic number.

It is an amenable number.

13431030021 is a deficient number, since it is larger than the sum of its proper divisors (6886010619).

13431030021 is a wasteful number, since it uses less digits than its factorization.

13431030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234545 (or 234542 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 13431030021 its reverse (12003013431), we get a palindrome (25434043452).

The spelling of 13431030021 in words is "thirteen billion, four hundred thirty-one million, thirty thousand, twenty-one".