20828621013412 has 6 divisors (see below), whose sum is σ = 36450086773478. Its totient is φ = 10414310506704.

The previous prime is 20828621013391. The next prime is 20828621013419. The reversal of 20828621013412 is 21431012682802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15021562086756 + 5807058926656 = 3875766^2 + 2409784^2 .

It is not an unprimeable number, because it can be changed into a prime (20828621013419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2603577626673 + ... + 2603577626680.

Almost surely, 2^{20828621013412} is an apocalyptic number.

It is an amenable number.

20828621013412 is a deficient number, since it is larger than the sum of its proper divisors (15621465760066).

20828621013412 is a wasteful number, since it uses less digits than its factorization.

20828621013412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5207155253357 (or 5207155253355 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 20828621013412 in words is "twenty trillion, eight hundred twenty-eight billion, six hundred twenty-one million, thirteen thousand, four hundred twelve".