121420404 has 96 divisors (see below), whose sum is σ = 375459840. Its totient is φ = 33178464.

The previous prime is 121420391. The next prime is 121420501. The reversal of 121420404 is 404024121.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13897 + ... + 20879.

It is an arithmetic number, because the mean of its divisors is an integer number (3911040).

Almost surely, 2^121420404 is an apocalyptic number.

121420404 is a gapful number since it is divisible by the number (14) 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 121420404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187729920).

121420404 is an abundant number, since it is smaller than the sum of its proper divisors (254039436).

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

121420404 is a wasteful number, since it uses less digits than its factorization.

121420404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7026 (or 7018 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 121420404 is about 11019.0927031222. The cubic root of 121420404 is about 495.1809072460.

Adding to 121420404 its reverse (404024121), we get a palindrome (525444525).

The spelling of 121420404 in words is "one hundred twenty-one million, four hundred twenty thousand, four hundred four".