21113310 has 64 divisors (see below), whose sum is σ = 54369792. Its totient is φ = 5233536.

The previous prime is 21113299. The next prime is 21113317. The reversal of 21113310 is 1331112.

It is a super-2 number, since 2×21113310² = 891543718312200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25117 + ... + 25943.

It is an arithmetic number, because the mean of its divisors is an integer number (849528).

Almost surely, 2^21113310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21113310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27184896).

21113310 is an abundant number, since it is smaller than the sum of its proper divisors (33256482).

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

21113310 is a wasteful number, since it uses less digits than its factorization.

21113310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 21113310 is about 4594.9221973827. The cubic root of 21113310 is about 276.3877400504.

Adding to 21113310 its reverse (1331112), we get a palindrome (22444422).

The spelling of 21113310 in words is "twenty-one million, one hundred thirteen thousand, three hundred ten".