21223134 has 24 divisors (see below), whose sum is σ = 47687640. Its totient is φ = 7074216.

The previous prime is 21223093. The next prime is 21223141. The reversal of 21223134 is 43132212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21349 + ... + 22320.

It is an arithmetic number, because the mean of its divisors is an integer number (1986985).

Almost surely, 2^21223134 is an apocalyptic number.

21223134 is an abundant number, since it is smaller than the sum of its proper divisors (26464506).

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

21223134 is an equidigital number, since it uses as much as digits as its factorization.

21223134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43686 (or 43674 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21223134 is about 4606.8572801857. The cubic root of 21223134 is about 276.8661354078.

Adding to 21223134 its reverse (43132212), we get a palindrome (64355346).

The spelling of 21223134 in words is "twenty-one million, two hundred twenty-three thousand, one hundred thirty-four".