21123022 has 16 divisors (see below), whose sum is σ = 34064640. Its totient is φ = 9791928.

The previous prime is 21123017. The next prime is 21123029. The reversal of 21123022 is 22032112.

It is a junction number, because it is equal to n+sod(n) for n = 21122993 and 21123011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123029) by changing a digit.

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, 4128 + ... + 7699.

It is an arithmetic number, because the mean of its divisors is an integer number (2129040).

Almost surely, 2^21123022 is an apocalyptic number.

21123022 is a deficient number, since it is larger than the sum of its proper divisors (12941618).

21123022 is a wasteful number, since it uses less digits than its factorization.

21123022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11895.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21123022 is about 4595.9788946426. The cubic root of 21123022 is about 276.4301124726.

Adding to 21123022 its reverse (22032112), we get a palindrome (43155134).

The spelling of 21123022 in words is "twenty-one million, one hundred twenty-three thousand, twenty-two".