44220521 has 2 divisors, whose sum is σ = 44220522. Its totient is φ = 44220520.

The previous prime is 44220499. The next prime is 44220523. The reversal of 44220521 is 12502244.

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., 27931225 + 16289296 = 5285^2 + 4036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44220521 is a prime.

It is a super-2 number, since 2×44220521² = 3910908955022882, which contains 22 as substring.

Together with 44220523, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 44220493 and 44220502.

It is not a weakly prime, because it can be changed into another prime (44220523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22110260 + 22110261.

It is an arithmetic number, because the mean of its divisors is an integer number (22110261).

Almost surely, 2^44220521 is an apocalyptic number.

It is an amenable number.

44220521 is a deficient number, since it is larger than the sum of its proper divisors (1).

44220521 is an equidigital number, since it uses as much as digits as its factorization.

44220521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 44220521 is about 6649.8512013428. The cubic root of 44220521 is about 353.6236357714.

Adding to 44220521 its reverse (12502244), we get a palindrome (56722765).

The spelling of 44220521 in words is "forty-four million, two hundred twenty thousand, five hundred twenty-one".