12121456 has 20 divisors (see below), whose sum is σ = 23577112. Its totient is φ = 6037056.

The previous prime is 12121451. The next prime is 12121457. The reversal of 12121456 is 65412121.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121451) 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 3 ways as a sum of consecutive naturals, for example, 3190 + ... + 5866.

Almost surely, 2^12121456 is an apocalyptic number.

12121456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12121456 is a deficient number, since it is larger than the sum of its proper divisors (11455656).

12121456 is a wasteful number, since it uses less digits than its factorization.

12121456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968 (or 2962 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 12121456 is about 3481.5881433622. The cubic root of 12121456 is about 229.7126594465.

Adding to 12121456 its reverse (65412121), we get a palindrome (77533577).

The spelling of 12121456 in words is "twelve million, one hundred twenty-one thousand, four hundred fifty-six".