21144022 has 8 divisors (see below), whose sum is σ = 33581736. Its totient is φ = 9950112.

The previous prime is 21143999. The next prime is 21144029. The reversal of 21144022 is 22044112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21143987 and 21144005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144029) 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 3 ways as a sum of consecutive naturals, for example, 310908 + ... + 310975.

It is an arithmetic number, because the mean of its divisors is an integer number (4197717).

Almost surely, 2^21144022 is an apocalyptic number.

21144022 is a deficient number, since it is larger than the sum of its proper divisors (12437714).

21144022 is a wasteful number, since it uses less digits than its factorization.

21144022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621902.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21144022 is about 4598.2629328911. The cubic root of 21144022 is about 276.5216888528.

Adding to 21144022 its reverse (22044112), we get a palindrome (43188134).

The spelling of 21144022 in words is "twenty-one million, one hundred forty-four thousand, twenty-two".