21336715105 has 8 divisors (see below), whose sum is σ = 25857564264. Its totient is φ = 16900368000.

The previous prime is 21336715097. The next prime is 21336715109. The reversal of 21336715105 is 50151763312.

It can be written as a sum of positive squares in 4 ways, for example, as 11564206369 + 9772508736 = 107537^2 + 98856^2 .

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

It is not a de Polignac number, because 21336715105 - 2³ = 21336715097 is a prime.

It is a super-2 number, since 2×21336715105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21336715109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21124956 + ... + 21125965.

It is an arithmetic number, because the mean of its divisors is an integer number (3232195533).

Almost surely, 2^21336715105 is an apocalyptic number.

It is an amenable number.

21336715105 is a deficient number, since it is larger than the sum of its proper divisors (4520849159).

21336715105 is a wasteful number, since it uses less digits than its factorization.

21336715105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42251027.

The product of its (nonzero) digits is 18900, while the sum is 34.

The spelling of 21336715105 in words is "twenty-one billion, three hundred thirty-six million, seven hundred fifteen thousand, one hundred five".