38021521 has 2 divisors, whose sum is σ = 38021522. Its totient is φ = 38021520.

The previous prime is 38021519. The next prime is 38021549. The reversal of 38021521 is 12512083.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32433025 + 5588496 = 5695^2 + 2364^2 .

It is an emirp because it is prime and its reverse (12512083) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38021521 - 2¹ = 38021519 is a prime.

Together with 38021519, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 38021492 and 38021501.

It is not a weakly prime, because it can be changed into another prime (38021561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19010760 + 19010761.

It is an arithmetic number, because the mean of its divisors is an integer number (19010761).

Almost surely, 2^38021521 is an apocalyptic number.

It is an amenable number.

38021521 is a deficient number, since it is larger than the sum of its proper divisors (1).

38021521 is an equidigital number, since it uses as much as digits as its factorization.

38021521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 38021521 is about 6166.1593394916. The cubic root of 38021521 is about 336.2609963099.

The spelling of 38021521 in words is "thirty-eight million, twenty-one thousand, five hundred twenty-one".