55201121 has 8 divisors (see below), whose sum is σ = 56584704. Its totient is φ = 53822160.

The previous prime is 55201087. The next prime is 55201141. The reversal of 55201121 is 12110255.

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 55201121 - 2¹⁸ = 54938977 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 55201121.

It is not an unprimeable number, because it can be changed into a prime (55201141) 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, 46151 + ... + 47331.

It is an arithmetic number, because the mean of its divisors is an integer number (7073088).

Almost surely, 2^55201121 is an apocalyptic number.

It is an amenable number.

55201121 is a deficient number, since it is larger than the sum of its proper divisors (1383583).

55201121 is a wasteful number, since it uses less digits than its factorization.

55201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311.

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

The square root of 55201121 is about 7429.7456887837. The cubic root of 55201121 is about 380.7582298335.

Adding to 55201121 its reverse (12110255), we get a palindrome (67311376).

The spelling of 55201121 in words is "fifty-five million, two hundred one thousand, one hundred twenty-one".