55121404 has 24 divisors (see below), whose sum is σ = 104146560. Its totient is φ = 25376064.

The previous prime is 55121401. The next prime is 55121419. The reversal of 55121404 is 40412155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121401) 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, 23802 + ... + 26014.

It is an arithmetic number, because the mean of its divisors is an integer number (4339440).

Almost surely, 2^55121404 is an apocalyptic number.

It is an amenable number.

55121404 is a deficient number, since it is larger than the sum of its proper divisors (49025156).

55121404 is a wasteful number, since it uses less digits than its factorization.

55121404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 55121404 is about 7424.3790312726. The cubic root of 55121404 is about 380.5748547736.

Adding to 55121404 its reverse (40412155), we get a palindrome (95533559).

The spelling of 55121404 in words is "fifty-five million, one hundred twenty-one thousand, four hundred four".