21442110 has 32 divisors (see below), whose sum is σ = 52309152. Its totient is φ = 5623680.

The previous prime is 21442103. The next prime is 21442133. The reversal of 21442110 is 1124412.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21442110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4029 + ... + 7688.

It is an arithmetic number, because the mean of its divisors is an integer number (1634661).

Almost surely, 2^21442110 is an apocalyptic number.

21442110 is an abundant number, since it is smaller than the sum of its proper divisors (30867042).

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

21442110 is a wasteful number, since it uses less digits than its factorization.

21442110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11788.

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

The square root of 21442110 is about 4630.5626008078. The cubic root of 21442110 is about 277.8150953716.

Adding to 21442110 its reverse (1124412), we get a palindrome (22566522).

It can be divided in two parts, 214 and 42110, that added together give a palindrome (42324).

The spelling of 21442110 in words is "twenty-one million, four hundred forty-two thousand, one hundred ten".