22308021 has 16 divisors (see below), whose sum is σ = 33196800. Its totient is φ = 14805504.

The previous prime is 22308001. The next prime is 22308043. The reversal of 22308021 is 12080322.

It is a happy number.

It is not a de Polignac number, because 22308021 - 2¹¹ = 22305973 is a prime.

It is a super-3 number, since 3×22308021³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22307985 and 22308003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22308001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4725 + ... + 8181.

It is an arithmetic number, because the mean of its divisors is an integer number (2074800).

Almost surely, 2^22308021 is an apocalyptic number.

It is an amenable number.

22308021 is a deficient number, since it is larger than the sum of its proper divisors (10888779).

22308021 is a wasteful number, since it uses less digits than its factorization.

22308021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705 (or 3699 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 22308021 is about 4723.1367754915. The cubic root of 22308021 is about 281.5055845573.

Adding to 22308021 its reverse (12080322), we get a palindrome (34388343).

The spelling of 22308021 in words is "twenty-two million, three hundred eight thousand, twenty-one".