21995856120676 has 9 divisors (see below), whose sum is σ = 38492764626099. Its totient is φ = 10997923370364.

The previous prime is 21995856120671. The next prime is 21995856120683. The reversal of 21995856120676 is 67602165859912.

The square root of 21995856120676 is 4689974.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21995856120671) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8207455 + ... + 10552441.

Almost surely, 2^{21995856120676} is an apocalyptic number.

21995856120676 is the 4689974-th square number.

It is an amenable number.

21995856120676 is a deficient number, since it is larger than the sum of its proper divisors (16496908505423).

21995856120676 is an frugal number, since it uses more digits than its factorization.

21995856120676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4689978 (or 2344989 counting only the distinct ones).

The product of its (nonzero) digits is 97977600, while the sum is 67.

The spelling of 21995856120676 in words is "twenty-one trillion, nine hundred ninety-five billion, eight hundred fifty-six million, one hundred twenty thousand, six hundred seventy-six".