55121222320 has 40 divisors (see below), whose sum is σ = 128181081600. Its totient is φ = 22044318720.

The previous prime is 55121222291. The next prime is 55121222341. The reversal of 55121222320 is 2322212155.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379281 + ... + 504079.

It is an arithmetic number, because the mean of its divisors is an integer number (3204527040).

Almost surely, 2^55121222320 is an apocalyptic number.

It is an amenable number.

55121222320 is an abundant number, since it is smaller than the sum of its proper divisors (73059859280).

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

55121222320 is a wasteful number, since it uses less digits than its factorization.

55121222320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130333 (or 130327 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 55121222320 its reverse (2322212155), we get a palindrome (57443434475).

The spelling of 55121222320 in words is "fifty-five billion, one hundred twenty-one million, two hundred twenty-two thousand, three hundred twenty".