55272121 has 4 divisors (see below), whose sum is σ = 58181200. Its totient is φ = 52363044.

The previous prime is 55272109. The next prime is 55272131. The reversal of 55272121 is 12127255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55272121 - 2⁵ = 55272089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55272131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1454511 + ... + 1454548.

It is an arithmetic number, because the mean of its divisors is an integer number (14545300).

Almost surely, 2^55272121 is an apocalyptic number.

It is an amenable number.

55272121 is a deficient number, since it is larger than the sum of its proper divisors (2909079).

55272121 is a wasteful number, since it uses less digits than its factorization.

55272121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909078.

The product of its digits is 1400, while the sum is 25.

The square root of 55272121 is about 7434.5222442333. The cubic root of 55272121 is about 380.9214043714.

Adding to 55272121 its reverse (12127255), we get a palindrome (67399376).

The spelling of 55272121 in words is "fifty-five million, two hundred seventy-two thousand, one hundred twenty-one".