22072521 has 8 divisors (see below), whose sum is σ = 29802880. Its totient is φ = 14528592.

The previous prime is 22072517. The next prime is 22072529. The reversal of 22072521 is 12527022.

It is a happy number.

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

It is not a de Polignac number, because 22072521 - 2² = 22072517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22072529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46330 + ... + 46803.

It is an arithmetic number, because the mean of its divisors is an integer number (3725360).

Almost surely, 2^22072521 is an apocalyptic number.

It is an amenable number.

22072521 is a deficient number, since it is larger than the sum of its proper divisors (7730359).

22072521 is an equidigital number, since it uses as much as digits as its factorization.

22072521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93215.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 22072521 is about 4698.1401639372. The cubic root of 22072521 is about 280.5114843052.

Adding to 22072521 its reverse (12527022), we get a palindrome (34599543).

The spelling of 22072521 in words is "twenty-two million, seventy-two thousand, five hundred twenty-one".