121220404 has 24 divisors (see below), whose sum is σ = 225779400. Its totient is φ = 56749056.

The previous prime is 121220401. The next prime is 121220413. The reversal of 121220404 is 404022121.

It can be written as a sum of positive squares in 4 ways, for example, as 90440100 + 30780304 = 9510^2 + 5548^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220401) 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, 8872 + ... + 17920.

It is an arithmetic number, because the mean of its divisors is an integer number (9407475).

Almost surely, 2^121220404 is an apocalyptic number.

It is an amenable number.

121220404 is a deficient number, since it is larger than the sum of its proper divisors (104558996).

121220404 is a wasteful number, since it uses less digits than its factorization.

121220404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9267 (or 9265 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 121220404 is about 11010.0138056226. The cubic root of 121220404 is about 494.9088755158.

Adding to 121220404 its reverse (404022121), we get a palindrome (525242525).

The spelling of 121220404 in words is "one hundred twenty-one million, two hundred twenty thousand, four hundred four".