55121101 has 8 divisors (see below), whose sum is σ = 63936320. Its totient is φ = 46541088.

The previous prime is 55121093. The next prime is 55121107. The reversal of 55121101 is 10112155.

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 55121101 - 2³ = 55121093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121107) 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, 58296 + ... + 59233.

It is an arithmetic number, because the mean of its divisors is an integer number (7992040).

Almost surely, 2^55121101 is an apocalyptic number.

It is an amenable number.

55121101 is a deficient number, since it is larger than the sum of its proper divisors (8815219).

55121101 is a wasteful number, since it uses less digits than its factorization.

55121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117603.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 55121101 is about 7424.3586254976. The cubic root of 55121101 is about 380.5741574377.

Adding to 55121101 its reverse (10112155), we get a palindrome (65233256).

The spelling of 55121101 in words is "fifty-five million, one hundred twenty-one thousand, one hundred one".