21836705539 has 16 divisors (see below), whose sum is σ = 24009874560. Its totient is φ = 19695072960.

The previous prime is 21836705531. The next prime is 21836705549. The reversal of 21836705539 is 93550763812.

It is a cyclic number.

It is not a de Polignac number, because 21836705539 - 2³ = 21836705531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21836705492 and 21836705501.

It is not an unprimeable number, because it can be changed into a prime (21836705531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2676264 + ... + 2684410.

It is an arithmetic number, because the mean of its divisors is an integer number (1500617160).

Almost surely, 2^21836705539 is an apocalyptic number.

21836705539 is a deficient number, since it is larger than the sum of its proper divisors (2173169021).

21836705539 is a wasteful number, since it uses less digits than its factorization.

21836705539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10050.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 21836705539 in words is "twenty-one billion, eight hundred thirty-six million, seven hundred five thousand, five hundred thirty-nine".