55012321 has 16 divisors (see below), whose sum is σ = 69895168. Its totient is φ = 42120000.

The previous prime is 55012313. The next prime is 55012327. The reversal of 55012321 is 12321055.

It is not a de Polignac number, because 55012321 - 2³ = 55012313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55012327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6930 + ... + 12571.

It is an arithmetic number, because the mean of its divisors is an integer number (4368448).

Almost surely, 2^55012321 is an apocalyptic number.

It is an amenable number.

55012321 is a deficient number, since it is larger than the sum of its proper divisors (14882847).

55012321 is a wasteful number, since it uses less digits than its factorization.

55012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19552.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 55012321 is about 7417.0291222295. The cubic root of 55012321 is about 380.3236416391.

Adding to 55012321 its reverse (12321055), we get a palindrome (67333376).

The spelling of 55012321 in words is "fifty-five million, twelve thousand, three hundred twenty-one".