22621221 has 16 divisors (see below), whose sum is σ = 38300800. Its totient is φ = 12926304.

The previous prime is 22621187. The next prime is 22621253. The reversal of 22621221 is 12212622.

22621221 is a `hidden beast` number, since 22 + 621 + 2 + 21 = 666.

It is not a de Polignac number, because 22621221 - 2¹³ = 22613029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22621194 and 22621203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22622221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59656 + ... + 60033.

It is an arithmetic number, because the mean of its divisors is an integer number (2393800).

Almost surely, 2^22621221 is an apocalyptic number.

22621221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22621221 is a deficient number, since it is larger than the sum of its proper divisors (15679579).

22621221 is a wasteful number, since it uses less digits than its factorization.

22621221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119705 (or 119699 counting only the distinct ones).

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

The square root of 22621221 is about 4756.1771413605. The cubic root of 22621221 is about 282.8168934596.

Adding to 22621221 its reverse (12212622), we get a palindrome (34833843).

The spelling of 22621221 in words is "twenty-two million, six hundred twenty-one thousand, two hundred twenty-one".