55021641 has 4 divisors (see below), whose sum is σ = 73362192. Its totient is φ = 36681092.

The previous prime is 55021619. The next prime is 55021643. The reversal of 55021641 is 14612055.

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 55021641 - 2⁷ = 55021513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55021643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9170271 + ... + 9170276.

It is an arithmetic number, because the mean of its divisors is an integer number (18340548).

Almost surely, 2^55021641 is an apocalyptic number.

It is an amenable number.

55021641 is a deficient number, since it is larger than the sum of its proper divisors (18340551).

55021641 is a wasteful number, since it uses less digits than its factorization.

55021641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18340550.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 55021641 is about 7417.6573795235. The cubic root of 55021641 is about 380.3451181382.

Adding to 55021641 its reverse (14612055), we get a palindrome (69633696).

The spelling of 55021641 in words is "fifty-five million, twenty-one thousand, six hundred forty-one".