22706021 has 16 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 20260800.

The previous prime is 22706017. The next prime is 22706039. The reversal of 22706021 is 12060722.

It is a cyclic number.

It is not a de Polignac number, because 22706021 - 2² = 22706017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22705984 and 22706002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22706071) 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, 84275 + ... + 84543.

It is an arithmetic number, because the mean of its divisors is an integer number (1580040).

Almost surely, 2^22706021 is an apocalyptic number.

It is an amenable number.

22706021 is a deficient number, since it is larger than the sum of its proper divisors (2574619).

22706021 is a wasteful number, since it uses less digits than its factorization.

22706021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 22706021 is about 4765.0835249762. The cubic root of 22706021 is about 283.1698506332.

Adding to 22706021 its reverse (12060722), we get a palindrome (34766743).

The spelling of 22706021 in words is "twenty-two million, seven hundred six thousand, twenty-one".