22536021 has 8 divisors (see below), whose sum is σ = 31354560. Its totient is φ = 14370752.

The previous prime is 22536011. The next prime is 22536037. The reversal of 22536021 is 12063522.

22536021 is nontrivially palindromic in base 4.

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

It is a cyclic number.

It is not a de Polignac number, because 22536021 - 2⁷ = 22535893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22536011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163236 + ... + 163373.

It is an arithmetic number, because the mean of its divisors is an integer number (3919320).

Almost surely, 2^22536021 is an apocalyptic number.

It is an amenable number.

22536021 is a deficient number, since it is larger than the sum of its proper divisors (8818539).

22536021 is a wasteful number, since it uses less digits than its factorization.

22536021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326635.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 22536021 is about 4747.2119185897. The cubic root of 22536021 is about 282.4613819349.

Adding to 22536021 its reverse (12063522), we get a palindrome (34599543).

The spelling of 22536021 in words is "twenty-two million, five hundred thirty-six thousand, twenty-one".