12121400 has 24 divisors (see below), whose sum is σ = 28182720. Its totient is φ = 4848480.

The previous prime is 12121393. The next prime is 12121423. The reversal of 12121400 is 412121.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 30104 + ... + 30503.

It is an arithmetic number, because the mean of its divisors is an integer number (1174280).

Almost surely, 2^12121400 is an apocalyptic number.

12121400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121400 is an abundant number, since it is smaller than the sum of its proper divisors (16061320).

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

12121400 is a wasteful number, since it uses less digits than its factorization.

12121400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60623 (or 60614 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 12121400 is about 3481.5801010461. The cubic root of 12121400 is about 229.7123056955.

Adding to 12121400 its reverse (412121), we get a palindrome (12533521).

It can be divided in two parts, 12121 and 400, that added together give a palindrome (12521).

The spelling of 12121400 in words is "twelve million, one hundred twenty-one thousand, four hundred".