21734537611 has 4 divisors (see below), whose sum is σ = 21749559472. Its totient is φ = 21719515752.

The previous prime is 21734537579. The next prime is 21734537623. The reversal of 21734537611 is 11673543712.

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

It is a cyclic number.

It is not a de Polignac number, because 21734537611 - 2⁵ = 21734537579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21734537911) 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, 7508760 + ... + 7511653.

It is an arithmetic number, because the mean of its divisors is an integer number (5437389868).

Almost surely, 2^21734537611 is an apocalyptic number.

21734537611 is a deficient number, since it is larger than the sum of its proper divisors (15021861).

21734537611 is a wasteful number, since it uses less digits than its factorization.

21734537611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15021860.

The product of its digits is 105840, while the sum is 40.

The spelling of 21734537611 in words is "twenty-one billion, seven hundred thirty-four million, five hundred thirty-seven thousand, six hundred eleven".