22541521 has 4 divisors (see below), whose sum is σ = 22605732. Its totient is φ = 22477312.

The previous prime is 22541501. The next prime is 22541537. The reversal of 22541521 is 12514522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12514522 = 2 ⋅6257261.

It can be written as a sum of positive squares in 2 ways, for example, as 12173121 + 10368400 = 3489^2 + 3220^2 .

It is a cyclic number.

It is not a de Polignac number, because 22541521 - 2¹⁷ = 22410449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22541492 and 22541501.

It is not an unprimeable number, because it can be changed into a prime (22541501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31576 + ... + 32281.

It is an arithmetic number, because the mean of its divisors is an integer number (5651433).

Almost surely, 2^22541521 is an apocalyptic number.

It is an amenable number.

22541521 is a deficient number, since it is larger than the sum of its proper divisors (64211).

22541521 is an equidigital number, since it uses as much as digits as its factorization.

22541521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64210.

The product of its digits is 800, while the sum is 22.

The square root of 22541521 is about 4747.7911706392. The cubic root of 22541521 is about 282.4843586505.

The spelling of 22541521 in words is "twenty-two million, five hundred forty-one thousand, five hundred twenty-one".