21073580537 has 4 divisors (see below), whose sum is σ = 21234447696. Its totient is φ = 20912713380.

The previous prime is 21073580497. The next prime is 21073580543. The reversal of 21073580537 is 73508537012.

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 a cyclic number.

It is not a de Polignac number, because 21073580537 - 2¹² = 21073576441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21073580494 and 21073580503.

It is not an unprimeable number, because it can be changed into a prime (21073580587) 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 3 ways as a sum of consecutive naturals, for example, 80433383 + ... + 80433644.

It is an arithmetic number, because the mean of its divisors is an integer number (5308611924).

Almost surely, 2^21073580537 is an apocalyptic number.

It is an amenable number.

21073580537 is a deficient number, since it is larger than the sum of its proper divisors (160867159).

21073580537 is a wasteful number, since it uses less digits than its factorization.

21073580537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160867158.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 21073580537 in words is "twenty-one billion, seventy-three million, five hundred eighty thousand, five hundred thirty-seven".