55020212204221 has 8 divisors (see below), whose sum is σ = 60028130441088. Its totient is φ = 50013307428000.

The previous prime is 55020212204171. The next prime is 55020212204231. The reversal of 55020212204221 is 12240221202055.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55020212204221 - 2⁹ = 55020212203709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55020212204221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55020212204231) 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, 253251640 + ... + 253468801.

It is an arithmetic number, because the mean of its divisors is an integer number (7503516305136).

Almost surely, 2^{55020212204221} is an apocalyptic number.

It is an amenable number.

55020212204221 is a deficient number, since it is larger than the sum of its proper divisors (5007918236867).

55020212204221 is a wasteful number, since it uses less digits than its factorization.

55020212204221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506730323.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 55020212204221 its reverse (12240221202055), we get a palindrome (67260433406276).

The spelling of 55020212204221 in words is "fifty-five trillion, twenty billion, two hundred twelve million, two hundred four thousand, two hundred twenty-one".