55204221421200 has 120 divisors (see below), whose sum is σ = 178824461421600. Its totient is φ = 14555719777280.

The previous prime is 55204221421171. The next prime is 55204221421211. The reversal of 55204221421200 is 212412240255.

It is a tau number, because it is divible by the number of its divisors (120).

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 23 ways as a sum of consecutive naturals, for example, 258339930 + ... + 258553529.

It is an arithmetic number, because the mean of its divisors is an integer number (1490203845180).

Almost surely, 2^{55204221421200} is an apocalyptic number.

55204221421200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55204221421200 is an abundant number, since it is smaller than the sum of its proper divisors (123620240000400).

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

55204221421200 is a wasteful number, since it uses less digits than its factorization.

55204221421200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516893569 (or 516893558 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 55204221421200 its reverse (212412240255), we get a palindrome (55416633661455).

The spelling of 55204221421200 in words is "fifty-five trillion, two hundred four billion, two hundred twenty-one million, four hundred twenty-one thousand, two hundred".