21707998477 has 8 divisors (see below), whose sum is σ = 23696939232. Its totient is φ = 19721638800.

The previous prime is 21707998469. The next prime is 21707998511. The reversal of 21707998477 is 77489970712.

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 21707998477 - 2³ = 21707998469 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 (21707992477) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 627658 + ... + 661339.

It is an arithmetic number, because the mean of its divisors is an integer number (2962117404).

Almost surely, 2^21707998477 is an apocalyptic number.

It is an amenable number.

21707998477 is a deficient number, since it is larger than the sum of its proper divisors (1988940755).

21707998477 is a wasteful number, since it uses less digits than its factorization.

21707998477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290539.

The product of its (nonzero) digits is 12446784, while the sum is 61.

The spelling of 21707998477 in words is "twenty-one billion, seven hundred seven million, nine hundred ninety-eight thousand, four hundred seventy-seven".