44228021 has 2 divisors, whose sum is σ = 44228022. Its totient is φ = 44228020.

The previous prime is 44227943. The next prime is 44228027. The reversal of 44228021 is 12082244.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43744996 + 483025 = 6614^2 + 695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44228021 is a prime.

It is a super-2 number, since 2×44228021² = 3912235683152882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44228027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22114010 + 22114011.

It is an arithmetic number, because the mean of its divisors is an integer number (22114011).

Almost surely, 2^44228021 is an apocalyptic number.

It is an amenable number.

44228021 is a deficient number, since it is larger than the sum of its proper divisors (1).

44228021 is an equidigital number, since it uses as much as digits as its factorization.

44228021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 44228021 is about 6650.4150998265. The cubic root of 44228021 is about 353.6436266963.

The spelling of 44228021 in words is "forty-four million, two hundred twenty-eight thousand, twenty-one".