21475773468 has 18 divisors (see below), whose sum is σ = 54285983024. Its totient is φ = 7158591144.

The previous prime is 21475773461. The next prime is 21475773503. The reversal of 21475773468 is 86437757412.

21475773468 is a `hidden beast` number, since 2 + 1 + 4 + 7 + 577 + 3 + 4 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21475773468² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475773461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 298274596 + ... + 298274667.

Almost surely, 2^21475773468 is an apocalyptic number.

It is an amenable number.

21475773468 is an abundant number, since it is smaller than the sum of its proper divisors (32810209556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21475773468 is a wasteful number, since it uses less digits than its factorization.

21475773468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596549273 (or 596549268 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 54.

The spelling of 21475773468 in words is "twenty-one billion, four hundred seventy-five million, seven hundred seventy-three thousand, four hundred sixty-eight".