21312433413 has 48 divisors (see below), whose sum is σ = 32086594800. Its totient is φ = 13615257600.

The previous prime is 21312433403. The next prime is 21312433423. The reversal of 21312433413 is 31433421312.

It is a happy number.

21312433413 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 243 + 3 + 413 = 666.

It is an interprime number because it is at equal distance from previous prime (21312433403) and next prime (21312433423).

It can be written as a sum of positive squares in 8 ways, for example, as 484748289 + 20827685124 = 22017^2 + 144318^2 .

It is not a de Polignac number, because 21312433413 - 2¹⁴ = 21312417029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312433403) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28153431 + ... + 28154187.

It is an arithmetic number, because the mean of its divisors is an integer number (668470725).

Almost surely, 2^21312433413 is an apocalyptic number.

It is an amenable number.

21312433413 is a deficient number, since it is larger than the sum of its proper divisors (10774161387).

21312433413 is a wasteful number, since it uses less digits than its factorization.

21312433413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462 (or 1459 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21312433413 its reverse (31433421312), we get a palindrome (52745854725).

The spelling of 21312433413 in words is "twenty-one billion, three hundred twelve million, four hundred thirty-three thousand, four hundred thirteen".