21701812473 has 48 divisors (see below), whose sum is σ = 34948742400. Its totient is φ = 12866480640.

The previous prime is 21701812471. The next prime is 21701812487. The reversal of 21701812473 is 37421810712.

21701812473 is a `hidden beast` number, since 2 + 1 + 7 + 0 + 181 + 2 + 473 = 666.

It is not a de Polignac number, because 21701812473 - 2¹ = 21701812471 is a prime.

It is a super-2 number, since 2×21701812473² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21701812471) 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 47 ways as a sum of consecutive naturals, for example, 839761 + ... + 865217.

It is an arithmetic number, because the mean of its divisors is an integer number (728098800).

Almost surely, 2^21701812473 is an apocalyptic number.

It is an amenable number.

21701812473 is a deficient number, since it is larger than the sum of its proper divisors (13246929927).

21701812473 is a wasteful number, since it uses less digits than its factorization.

21701812473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25662 (or 25659 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The spelling of 21701812473 in words is "twenty-one billion, seven hundred one million, eight hundred twelve thousand, four hundred seventy-three".