55121433420 has 48 divisors (see below), whose sum is σ = 163418840928. Its totient is φ = 13834398720.

The previous prime is 55121433413. The next prime is 55121433457. The reversal of 55121433420 is 2433412155.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27019291 + ... + 27021330.

It is an arithmetic number, because the mean of its divisors is an integer number (3404559186).

Almost surely, 2^55121433420 is an apocalyptic number.

It is an amenable number.

55121433420 is an abundant number, since it is smaller than the sum of its proper divisors (108297407508).

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

55121433420 is a wasteful number, since it uses less digits than its factorization.

55121433420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54040650 (or 54040648 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 55121433420 its reverse (2433412155), we get a palindrome (57554845575).

The spelling of 55121433420 in words is "fifty-five billion, one hundred twenty-one million, four hundred thirty-three thousand, four hundred twenty".