21110442 has 16 divisors (see below), whose sum is σ = 43583232. Its totient is φ = 6809760.

The previous prime is 21110437. The next prime is 21110443. The reversal of 21110442 is 24401112.

It is a super-2 number, since 2×21110442² = 891301522870728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21110443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56563 + ... + 56934.

It is an arithmetic number, because the mean of its divisors is an integer number (2723952).

Almost surely, 2^21110442 is an apocalyptic number.

21110442 is an abundant number, since it is smaller than the sum of its proper divisors (22472790).

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

21110442 is a wasteful number, since it uses less digits than its factorization.

21110442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113533.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21110442 is about 4594.6101031535. The cubic root of 21110442 is about 276.3752247866.

Adding to 21110442 its reverse (24401112), we get a palindrome (45511554).

The spelling of 21110442 in words is "twenty-one million, one hundred ten thousand, four hundred forty-two".