21043022 has 64 divisors (see below), whose sum is σ = 44319744. Its totient is φ = 7223040.

The previous prime is 21043021. The next prime is 21043027. The reversal of 21043022 is 22034012.

It is a super-4 number, since 4×21043022⁴ (a number of 30 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21042988 and 21043006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043021) 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 31 ways as a sum of consecutive naturals, for example, 45818 + ... + 46274.

It is an arithmetic number, because the mean of its divisors is an integer number (692496).

Almost surely, 2^21043022 is an apocalyptic number.

21043022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21043022 is an abundant number, since it is smaller than the sum of its proper divisors (23276722).

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

21043022 is a wasteful number, since it uses less digits than its factorization.

21043022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21043022 is about 4587.2673782983. The cubic root of 21043022 is about 276.0806929920.

Adding to 21043022 its reverse (22034012), we get a palindrome (43077034).

The spelling of 21043022 in words is "twenty-one million, forty-three thousand, twenty-two".