22646221 has 4 divisors (see below), whose sum is σ = 24388252. Its totient is φ = 20904192.

The previous prime is 22646207. The next prime is 22646243. The reversal of 22646221 is 12264622.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8122500 + 14523721 = 2850^2 + 3811^2 .

It is a cyclic number.

It is not a de Polignac number, because 22646221 - 2⁷ = 22646093 is a prime.

It is a super-3 number, since 3×22646221³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22646021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 870996 + ... + 871021.

It is an arithmetic number, because the mean of its divisors is an integer number (6097063).

Almost surely, 2^22646221 is an apocalyptic number.

It is an amenable number.

22646221 is a deficient number, since it is larger than the sum of its proper divisors (1742031).

22646221 is a wasteful number, since it uses less digits than its factorization.

22646221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742030.

The product of its digits is 2304, while the sum is 25.

The square root of 22646221 is about 4758.8045767819. The cubic root of 22646221 is about 282.9210407894.

The spelling of 22646221 in words is "twenty-two million, six hundred forty-six thousand, two hundred twenty-one".