55212101 has 8 divisors (see below), whose sum is σ = 63145344. Its totient is φ = 47290320.

The previous prime is 55212083. The next prime is 55212127. The reversal of 55212101 is 10121255.

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

It is a de Polignac number, because none of the positive numbers 2^k-55212101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55212191) 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, 14471 + ... + 17883.

It is an arithmetic number, because the mean of its divisors is an integer number (7893168).

Almost surely, 2^55212101 is an apocalyptic number.

It is an amenable number.

55212101 is a deficient number, since it is larger than the sum of its proper divisors (7933243).

55212101 is a wasteful number, since it uses less digits than its factorization.

55212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 55212101 is about 7430.4845737004. The cubic root of 55212101 is about 380.7834735732.

Adding to 55212101 its reverse (10121255), we get a palindrome (65333356).

The spelling of 55212101 in words is "fifty-five million, two hundred twelve thousand, one hundred one".