21842106 has 32 divisors (see below), whose sum is σ = 51323328. Its totient is φ = 6109440.

The previous prime is 21842101. The next prime is 21842123. The reversal of 21842106 is 60124812.

It is not an unprimeable number, because it can be changed into a prime (21842101) 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, 11871 + ... + 13586.

It is an arithmetic number, because the mean of its divisors is an integer number (1603854).

Almost surely, 2^21842106 is an apocalyptic number.

21842106 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21842106 is an abundant number, since it is smaller than the sum of its proper divisors (29481222).

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

21842106 is a wasteful number, since it uses less digits than its factorization.

21842106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25486.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21842106 is about 4673.5538939869. The cubic root of 21842106 is about 279.5319817517.

Adding to 21842106 its reverse (60124812), we get a palindrome (81966918).

It can be divided in two parts, 218 and 42106, that added together give a palindrome (42324).

The spelling of 21842106 in words is "twenty-one million, eight hundred forty-two thousand, one hundred six".