121404312 has 64 divisors (see below), whose sum is σ = 338352000. Its totient is φ = 40334112.

The previous prime is 121404301. The next prime is 121404313. The reversal of 121404312 is 213404121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121404313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81123 + ... + 82605.

It is an arithmetic number, because the mean of its divisors is an integer number (5286750).

Almost surely, 2^121404312 is an apocalyptic number.

121404312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121404312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169176000).

121404312 is an abundant number, since it is smaller than the sum of its proper divisors (216947688).

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

121404312 is a wasteful number, since it uses less digits than its factorization.

121404312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 121404312 is about 11018.3624917680. The cubic root of 121404312 is about 495.1590306285.

Adding to 121404312 its reverse (213404121), we get a palindrome (334808433).

The spelling of 121404312 in words is "one hundred twenty-one million, four hundred four thousand, three hundred twelve".