21946912479 has 6 divisors (see below), whose sum is σ = 31701095816. Its totient is φ = 14631274980.

The previous prime is 21946912451. The next prime is 21946912543. The reversal of 21946912479 is 97421964912.

21946912479 is a `hidden beast` number, since 21 + 94 + 69 + 1 + 2 + 479 = 666.

It is not a de Polignac number, because 21946912479 - 2⁸ = 21946912223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21946912079) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 1219272907 + ... + 1219272924.

Almost surely, 2^21946912479 is an apocalyptic number.

21946912479 is a deficient number, since it is larger than the sum of its proper divisors (9754183337).

21946912479 is a wasteful number, since it uses less digits than its factorization.

21946912479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438545837 (or 2438545834 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 21946912479 in words is "twenty-one billion, nine hundred forty-six million, nine hundred twelve thousand, four hundred seventy-nine".