21473175837 has 4 divisors (see below), whose sum is σ = 28630901120. Its totient is φ = 14315450556.

The previous prime is 21473175809. The next prime is 21473175853. The reversal of 21473175837 is 73857137412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21473175837 - 2¹⁰ = 21473174813 is a prime.

It is a super-2 number, since 2×21473175837² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473175037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3578862637 + ... + 3578862642.

It is an arithmetic number, because the mean of its divisors is an integer number (7157725280).

Almost surely, 2^21473175837 is an apocalyptic number.

It is an amenable number.

21473175837 is a deficient number, since it is larger than the sum of its proper divisors (7157725283).

21473175837 is an equidigital number, since it uses as much as digits as its factorization.

21473175837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7157725282.

The product of its digits is 987840, while the sum is 48.

The spelling of 21473175837 in words is "twenty-one billion, four hundred seventy-three million, one hundred seventy-five thousand, eight hundred thirty-seven".