21475289973 has 8 divisors (see below), whose sum is σ = 28793685600. Its totient is φ = 14236877168.

The previous prime is 21475289963. The next prime is 21475289993. The reversal of 21475289973 is 37998257412.

It is a happy number.

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 21475289973 - 2⁶ = 21475289909 is a prime.

It is a super-2 number, since 2×21475289973² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475289903) 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, 19995078 + ... + 19996151.

It is an arithmetic number, because the mean of its divisors is an integer number (3599210700).

Almost surely, 2^21475289973 is an apocalyptic number.

It is an amenable number.

21475289973 is a deficient number, since it is larger than the sum of its proper divisors (7318395627).

21475289973 is a wasteful number, since it uses less digits than its factorization.

21475289973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39991411.

The product of its digits is 7620480, while the sum is 57.

The spelling of 21475289973 in words is "twenty-one billion, four hundred seventy-five million, two hundred eighty-nine thousand, nine hundred seventy-three".