55221245 has 16 divisors (see below), whose sum is σ = 68504832. Its totient is φ = 42705600.

The previous prime is 55221241. The next prime is 55221247. The reversal of 55221245 is 54212255.

It is not a de Polignac number, because 55221245 - 2² = 55221241 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20444 + ... + 22986.

It is an arithmetic number, because the mean of its divisors is an integer number (4281552).

Almost surely, 2^55221245 is an apocalyptic number.

It is an amenable number.

55221245 is a deficient number, since it is larger than the sum of its proper divisors (13283587).

55221245 is a wasteful number, since it uses less digits than its factorization.

55221245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692.

The product of its digits is 4000, while the sum is 26.

The square root of 55221245 is about 7431.0998513006. The cubic root of 55221245 is about 380.8044936746.

The spelling of 55221245 in words is "fifty-five million, two hundred twenty-one thousand, two hundred forty-five".