21660113310 has 32 divisors (see below), whose sum is σ = 56710115712. Its totient is φ = 5250936480.

The previous prime is 21660113281. The next prime is 21660113317. The reversal of 21660113310 is 1331106612.

It is a super-3 number, since 3×21660113310³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660113317) 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, 32818024 + ... + 32818683.

It is an arithmetic number, because the mean of its divisors is an integer number (1772191116).

Almost surely, 2^21660113310 is an apocalyptic number.

21660113310 is an abundant number, since it is smaller than the sum of its proper divisors (35050002402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21660113310 is a wasteful number, since it uses less digits than its factorization.

21660113310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65636728.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21660113310 its reverse (1331106612), we get a palindrome (22991219922).

The spelling of 21660113310 in words is "twenty-one billion, six hundred sixty million, one hundred thirteen thousand, three hundred ten".