49920221 has 4 divisors (see below), whose sum is σ = 53760252. Its totient is φ = 46080192.

The previous prime is 49920203. The next prime is 49920229. The reversal of 49920221 is 12202994.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6175225 + 43744996 = 2485^2 + 6614^2 .

It is a cyclic number.

It is not a de Polignac number, because 49920221 - 2¹⁰ = 49919197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49920229) 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 3 ways as a sum of consecutive naturals, for example, 1919996 + ... + 1920021.

It is an arithmetic number, because the mean of its divisors is an integer number (13440063).

Almost surely, 2^49920221 is an apocalyptic number.

It is an amenable number.

49920221 is a deficient number, since it is larger than the sum of its proper divisors (3840031).

49920221 is a wasteful number, since it uses less digits than its factorization.

49920221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840030.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 49920221 is about 7065.4243326215. The cubic root of 49920221 is about 368.2071066602.

The spelling of 49920221 in words is "forty-nine million, nine hundred twenty thousand, two hundred twenty-one".