21683082436 has 6 divisors (see below), whose sum is σ = 37945394270. Its totient is φ = 10841541216.

The previous prime is 21683082367. The next prime is 21683082451. The reversal of 21683082436 is 63428038612.

It can be written as a sum of positive squares in only one way, i.e., 18907900036 + 2775182400 = 137506^2 + 52680^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21683082392 and 21683082401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2710385301 + ... + 2710385308.

Almost surely, 2^21683082436 is an apocalyptic number.

It is an amenable number.

21683082436 is a deficient number, since it is larger than the sum of its proper divisors (16262311834).

21683082436 is a wasteful number, since it uses less digits than its factorization.

21683082436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5420770613 (or 5420770611 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 21683082436 in words is "twenty-one billion, six hundred eighty-three million, eighty-two thousand, four hundred thirty-six".