21062867537 has 4 divisors (see below), whose sum is σ = 21299529060. Its totient is φ = 20826206016.

The previous prime is 21062867491. The next prime is 21062867569. The reversal of 21062867537 is 73576826012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3968874001 + 17093993536 = 62999^2 + 130744^2 .

It is a cyclic number.

It is not a de Polignac number, because 21062867537 - 2²⁶ = 20995758673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21062867491 and 21062867500.

It is not an unprimeable number, because it can be changed into a prime (21062867437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118330628 + ... + 118330805.

It is an arithmetic number, because the mean of its divisors is an integer number (5324882265).

Almost surely, 2^21062867537 is an apocalyptic number.

It is an amenable number.

21062867537 is a deficient number, since it is larger than the sum of its proper divisors (236661523).

21062867537 is an equidigital number, since it uses as much as digits as its factorization.

21062867537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236661522.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 21062867537 in words is "twenty-one billion, sixty-two million, eight hundred sixty-seven thousand, five hundred thirty-seven".