22140521 has 6 divisors (see below), whose sum is σ = 23974830. Its totient is φ = 20437248.

The previous prime is 22140509. The next prime is 22140523. The reversal of 22140521 is 12504122.

It can be written as a sum of positive squares in 3 ways, for example, as 648025 + 21492496 = 805^2 + 4636^2 .

It is not a de Polignac number, because 22140521 - 2²² = 17946217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22140521.

It is not an unprimeable number, because it can be changed into a prime (22140523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65336 + ... + 65673.

It is an arithmetic number, because the mean of its divisors is an integer number (3995805).

Almost surely, 2^22140521 is an apocalyptic number.

It is an amenable number.

22140521 is a deficient number, since it is larger than the sum of its proper divisors (1834309).

22140521 is a wasteful number, since it uses less digits than its factorization.

22140521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131035 (or 131022 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 22140521 is about 4705.3715049930. The cubic root of 22140521 is about 280.7992512554.

Adding to 22140521 its reverse (12504122), we get a palindrome (34644643).

The spelling of 22140521 in words is "twenty-two million, one hundred forty thousand, five hundred twenty-one".