55100121 has 8 divisors (see below), whose sum is σ = 75030144. Its totient is φ = 35951760.

The previous prime is 55100081. The next prime is 55100153. The reversal of 55100121 is 12100155.

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

It is not a de Polignac number, because 55100121 - 2¹¹ = 55098073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55100121.

It is not an unprimeable number, because it can be changed into a prime (55100161) 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, 195250 + ... + 195531.

It is an arithmetic number, because the mean of its divisors is an integer number (9378768).

Almost surely, 2^55100121 is an apocalyptic number.

It is an amenable number.

55100121 is a deficient number, since it is larger than the sum of its proper divisors (19930023).

55100121 is a wasteful number, since it uses less digits than its factorization.

55100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390831.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 55100121 is about 7422.9455743660. The cubic root of 55100121 is about 380.5258670438.

Adding to 55100121 its reverse (12100155), we get a palindrome (67200276).

The spelling of 55100121 in words is "fifty-five million, one hundred thousand, one hundred twenty-one".