21131020412 has 6 divisors (see below), whose sum is σ = 36979285728. Its totient is φ = 10565510204.

The previous prime is 21131020357. The next prime is 21131020423. The reversal of 21131020412 is 21402013112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2641377548 + ... + 2641377555.

It is an arithmetic number, because the mean of its divisors is an integer number (6163214288).

Almost surely, 2^21131020412 is an apocalyptic number.

It is an amenable number.

21131020412 is a deficient number, since it is larger than the sum of its proper divisors (15848265316).

21131020412 is a wasteful number, since it uses less digits than its factorization.

21131020412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5282755107 (or 5282755105 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21131020412 its reverse (21402013112), we get a palindrome (42533033524).

The spelling of 21131020412 in words is "twenty-one billion, one hundred thirty-one million, twenty thousand, four hundred twelve".