21159709485 has 16 divisors (see below), whose sum is σ = 33863977536. Its totient is φ = 11282364288.

The previous prime is 21159709421. The next prime is 21159709489. The reversal of 21159709485 is 58490795112.

It is not a de Polignac number, because 21159709485 - 2⁶ = 21159709421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21159709489) 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, 112999 + ... + 234708.

It is an arithmetic number, because the mean of its divisors is an integer number (2116498596).

Almost surely, 2^21159709485 is an apocalyptic number.

It is an amenable number.

21159709485 is a deficient number, since it is larger than the sum of its proper divisors (12704268051).

21159709485 is a wasteful number, since it uses less digits than its factorization.

21159709485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351772.

The product of its (nonzero) digits is 907200, while the sum is 51.

The spelling of 21159709485 in words is "twenty-one billion, one hundred fifty-nine million, seven hundred nine thousand, four hundred eighty-five".