121512404 has 24 divisors (see below), whose sum is σ = 238963200. Its totient is φ = 53643744.

The previous prime is 121512401. The next prime is 121512431. The reversal of 121512404 is 404215121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121512401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49604 + ... + 51995.

It is an arithmetic number, because the mean of its divisors is an integer number (9956800).

Almost surely, 2^121512404 is an apocalyptic number.

It is an amenable number.

121512404 is a deficient number, since it is larger than the sum of its proper divisors (117450796).

121512404 is a wasteful number, since it uses less digits than its factorization.

121512404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101639 (or 101637 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 121512404 is about 11023.2664850307. The cubic root of 121512404 is about 495.3059415366.

Adding to 121512404 its reverse (404215121), we get a palindrome (525727525).

The spelling of 121512404 in words is "one hundred twenty-one million, five hundred twelve thousand, four hundred four".