21611301537 has 16 divisors (see below), whose sum is σ = 34664744960. Its totient is φ = 11699350992.

The previous prime is 21611301521. The next prime is 21611301563. The reversal of 21611301537 is 73510311612.

It is not a de Polignac number, because 21611301537 - 2⁴ = 21611301521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21611301637) 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 15 ways as a sum of consecutive naturals, for example, 27081433 + ... + 27082230.

It is an arithmetic number, because the mean of its divisors is an integer number (2166546560).

Almost surely, 2^21611301537 is an apocalyptic number.

It is an amenable number.

21611301537 is a deficient number, since it is larger than the sum of its proper divisors (13053443423).

21611301537 is a wasteful number, since it uses less digits than its factorization.

21611301537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54163692.

The product of its (nonzero) digits is 3780, while the sum is 30.

The spelling of 21611301537 in words is "twenty-one billion, six hundred eleven million, three hundred one thousand, five hundred thirty-seven".