21863122 has 16 divisors (see below), whose sum is σ = 35845632. Its totient is φ = 9956160.

The previous prime is 21863119. The next prime is 21863141. The reversal of 21863122 is 22136812.

It is a super-2 number, since 2×21863122² = 955992207173768, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9318 + ... + 11425.

It is an arithmetic number, because the mean of its divisors is an integer number (2240352).

Almost surely, 2^21863122 is an apocalyptic number.

21863122 is a deficient number, since it is larger than the sum of its proper divisors (13982510).

21863122 is a wasteful number, since it uses less digits than its factorization.

21863122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20793.

The product of its digits is 1152, while the sum is 25.

The square root of 21863122 is about 4675.8017494329. The cubic root of 21863122 is about 279.6216062135.

Adding to 21863122 its reverse (22136812), we get a palindrome (43999934).

The spelling of 21863122 in words is "twenty-one million, eight hundred sixty-three thousand, one hundred twenty-two".