21948473814689 has 8 divisors (see below), whose sum is σ = 22069867600872. Its totient is φ = 21827081473920.

The previous prime is 21948473814629. The next prime is 21948473814697. The reversal of 21948473814689 is 98641837484912.

It can be written as a sum of positive squares in 4 ways, for example, as 44061368464 + 21904412446225 = 209908^2 + 4680215^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21948473814689 - 2⁸ = 21948473814433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21948473814629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47753117 + ... + 48210549.

It is an arithmetic number, because the mean of its divisors is an integer number (2758733450109).

Almost surely, 2^{21948473814689} is an apocalyptic number.

It is an amenable number.

21948473814689 is a deficient number, since it is larger than the sum of its proper divisors (121393786183).

21948473814689 is a wasteful number, since it uses less digits than its factorization.

21948473814689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722707.

The product of its digits is 668860416, while the sum is 74.

The spelling of 21948473814689 in words is "twenty-one trillion, nine hundred forty-eight billion, four hundred seventy-three million, eight hundred fourteen thousand, six hundred eighty-nine".