21398076676 has 6 divisors (see below), whose sum is σ = 37446634190. Its totient is φ = 10699038336.

The previous prime is 21398076649. The next prime is 21398076719. The reversal of 21398076676 is 67667089312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17430336576 + 3967740100 = 132024^2 + 62990^2 .

It is an unprimeable number.

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, 2674759581 + ... + 2674759588.

Almost surely, 2^21398076676 is an apocalyptic number.

It is an amenable number.

21398076676 is a deficient number, since it is larger than the sum of its proper divisors (16048557514).

21398076676 is a wasteful number, since it uses less digits than its factorization.

21398076676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5349519173 (or 5349519171 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 21398076676 in words is "twenty-one billion, three hundred ninety-eight million, seventy-six thousand, six hundred seventy-six".