45021521 has 8 divisors (see below), whose sum is σ = 45805344. Its totient is φ = 44241120.

The previous prime is 45021497. The next prime is 45021523. The reversal of 45021521 is 12512054.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45021521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45021493 and 45021502.

It is not an unprimeable number, because it can be changed into a prime (45021523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50546 + ... + 51428.

It is an arithmetic number, because the mean of its divisors is an integer number (5725668).

Almost surely, 2^45021521 is an apocalyptic number.

It is an amenable number.

45021521 is a deficient number, since it is larger than the sum of its proper divisors (783823).

45021521 is an equidigital number, since it uses as much as digits as its factorization.

45021521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 45021521 is about 6709.8078213910. The cubic root of 45021521 is about 355.7460235610.

Adding to 45021521 its reverse (12512054), we get a palindrome (57533575).

The spelling of 45021521 in words is "forty-five million, twenty-one thousand, five hundred twenty-one".