22212261 has 18 divisors (see below), whose sum is σ = 32683430. Its totient is φ = 14536656.

The previous prime is 22212257. The next prime is 22212271. The reversal of 22212261 is 16221222.

It can be written as a sum of positive squares in only one way, i.e., 15163236 + 7049025 = 3894^2 + 2655^2 .

It is not a de Polignac number, because 22212261 - 2² = 22212257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212271) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 30975 + ... + 31683.

Almost surely, 2^22212261 is an apocalyptic number.

It is an amenable number.

22212261 is a deficient number, since it is larger than the sum of its proper divisors (10471169).

22212261 is an equidigital number, since it uses as much as digits as its factorization.

22212261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833 (or 771 counting only the distinct ones).

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

The square root of 22212261 is about 4712.9885423158. The cubic root of 22212261 is about 281.1022073879.

Adding to 22212261 its reverse (16221222), we get a palindrome (38433483).

The spelling of 22212261 in words is "twenty-two million, two hundred twelve thousand, two hundred sixty-one".