21443712812829 has 12 divisors (see below), whose sum is σ = 30974585703516. Its totient is φ = 14295654451392.

The previous prime is 21443712812813. The next prime is 21443712812887. The reversal of 21443712812829 is 92821821734412.

21443712812829 is a `hidden beast` number, since 2 + 1 + 4 + 437 + 128 + 1 + 2 + 82 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13710002100804 + 7733710712025 = 3702702^2 + 2780955^2 .

It is not a de Polignac number, because 21443712812829 - 2⁴ = 21443712812813 is a prime.

It is a super-4 number, since 4×21443712812829⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443712852829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11956302 + ... + 13632335.

It is an arithmetic number, because the mean of its divisors is an integer number (2581215475293).

Almost surely, 2^{21443712812829} is an apocalyptic number.

It is an amenable number.

21443712812829 is a deficient number, since it is larger than the sum of its proper divisors (9530872890687).

21443712812829 is a wasteful number, since it uses less digits than its factorization.

21443712812829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25681756 (or 25681753 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 21443712812829 in words is "twenty-one trillion, four hundred forty-three billion, seven hundred twelve million, eight hundred twelve thousand, eight hundred twenty-nine".