21060736258 has 8 divisors (see below), whose sum is σ = 31726689228. Its totient is φ = 10485173184.

The previous prime is 21060736187. The next prime is 21060736267. The reversal of 21060736258 is 85263706012.

It can be written as a sum of positive squares in 2 ways, for example, as 18652184329 + 2408551929 = 136573^2 + 49077^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21060736258² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21060736258.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22596891 + ... + 22597822.

Almost surely, 2^21060736258 is an apocalyptic number.

21060736258 is a deficient number, since it is larger than the sum of its proper divisors (10665952970).

21060736258 is a wasteful number, since it uses less digits than its factorization.

21060736258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45194948.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21060736258 in words is "twenty-one billion, sixty million, seven hundred thirty-six thousand, two hundred fifty-eight".