21670626676 has 6 divisors (see below), whose sum is σ = 37923596690. Its totient is φ = 10835313336.

The previous prime is 21670626667. The next prime is 21670626683. The reversal of 21670626676 is 67662607612.

It can be written as a sum of positive squares in only one way, i.e., 20887186576 + 783440100 = 144524^2 + 27990^2 .

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, 2708828331 + ... + 2708828338.

Almost surely, 2^21670626676 is an apocalyptic number.

It is an amenable number.

21670626676 is a deficient number, since it is larger than the sum of its proper divisors (16252970014).

21670626676 is a wasteful number, since it uses less digits than its factorization.

21670626676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5417656673 (or 5417656671 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 21670626676 in words is "twenty-one billion, six hundred seventy million, six hundred twenty-six thousand, six hundred seventy-six".