21845022 has 32 divisors (see below), whose sum is σ = 47241600. Its totient is φ = 6710688.

The previous prime is 21844993. The next prime is 21845029. The reversal of 21845022 is 22054812.

It is a junction number, because it is equal to n+sod(n) for n = 21844983 and 21845001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21845029) 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, 1629 + ... + 6807.

It is an arithmetic number, because the mean of its divisors is an integer number (1476300).

Almost surely, 2^21845022 is an apocalyptic number.

21845022 is an abundant number, since it is smaller than the sum of its proper divisors (25396578).

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

21845022 is a wasteful number, since it uses less digits than its factorization.

21845022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 21845022 is about 4673.8658517334. The cubic root of 21845022 is about 279.5444207078.

Adding to 21845022 its reverse (22054812), we get a palindrome (43899834).

The spelling of 21845022 in words is "twenty-one million, eight hundred forty-five thousand, twenty-two".