21307105537 has 8 divisors (see below), whose sum is σ = 21778624512. Its totient is φ = 20836344000.

The previous prime is 21307105517. The next prime is 21307105543. The reversal of 21307105537 is 73550170312.

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 21307105537 - 2¹⁵ = 21307072769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21307105507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132289 + ... + 245182.

It is an arithmetic number, because the mean of its divisors is an integer number (2722328064).

Almost surely, 2^21307105537 is an apocalyptic number.

It is an amenable number.

21307105537 is a deficient number, since it is larger than the sum of its proper divisors (471518975).

21307105537 is a wasteful number, since it uses less digits than its factorization.

21307105537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378719.

The product of its (nonzero) digits is 22050, while the sum is 34.

Adding to 21307105537 its reverse (73550170312), we get a palindrome (94857275849).

The spelling of 21307105537 in words is "twenty-one billion, three hundred seven million, one hundred five thousand, five hundred thirty-seven".