22005021 has 16 divisors (see below), whose sum is σ = 32702400. Its totient is φ = 13079808.

The previous prime is 22005019. The next prime is 22005031. The reversal of 22005021 is 12050022.

It is not a de Polignac number, because 22005021 - 2¹ = 22005019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22004988 and 22005006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22005031) 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, 10386 + ... + 12323.

It is an arithmetic number, because the mean of its divisors is an integer number (2043900).

Almost surely, 2^22005021 is an apocalyptic number.

It is an amenable number.

22005021 is a deficient number, since it is larger than the sum of its proper divisors (10697379).

22005021 is a wasteful number, since it uses less digits than its factorization.

22005021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22748.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 22005021 is about 4690.9509696862. The cubic root of 22005021 is about 280.2252481705.

Adding to 22005021 its reverse (12050022), we get a palindrome (34055043).

The spelling of 22005021 in words is "twenty-two million, five thousand, twenty-one".