21131313334 has 24 divisors (see below), whose sum is σ = 33512275368. Its totient is φ = 9991844640.

The previous prime is 21131313299. The next prime is 21131313347. The reversal of 21131313334 is 43331313112.

It is a junction number, because it is equal to n+sod(n) for n = 21131313299 and 21131313308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 386634 + ... + 437890.

It is an arithmetic number, because the mean of its divisors is an integer number (1396344807).

Almost surely, 2^21131313334 is an apocalyptic number.

21131313334 is a deficient number, since it is larger than the sum of its proper divisors (12380962034).

21131313334 is a wasteful number, since it uses less digits than its factorization.

21131313334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51868 (or 51849 counting only the distinct ones).

The product of its digits is 1944, while the sum is 25.

Adding to 21131313334 its reverse (43331313112), we get a palindrome (64462626446).

The spelling of 21131313334 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirteen thousand, three hundred thirty-four".