12213534 has 16 divisors (see below), whose sum is σ = 24665472. Its totient is φ = 4031448.

The previous prime is 12213527. The next prime is 12213541. The reversal of 12213534 is 43531221.

It is an interprime number because it is at equal distance from previous prime (12213527) and next prime (12213541).

It is a self number, because there is not a number n which added to its sum of digits gives 12213534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9264 + ... + 10499.

It is an arithmetic number, because the mean of its divisors is an integer number (1541592).

Almost surely, 2^12213534 is an apocalyptic number.

12213534 is an abundant number, since it is smaller than the sum of its proper divisors (12451938).

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

12213534 is a wasteful number, since it uses less digits than its factorization.

12213534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19871.

The product of its digits is 720, while the sum is 21.

The square root of 12213534 is about 3494.7866887694. The cubic root of 12213534 is about 230.2928468870.

Adding to 12213534 its reverse (43531221), we get a palindrome (55744755).

The spelling of 12213534 in words is "twelve million, two hundred thirteen thousand, five hundred thirty-four".