22229281 has 4 divisors (see below), whose sum is σ = 22245700. Its totient is φ = 22212864.

The previous prime is 22229269. The next prime is 22229287. The reversal of 22229281 is 18292222.

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 12250000 + 9979281 = 3500^2 + 3159^2 .

It is a cyclic number.

It is not a de Polignac number, because 22229281 - 2²¹ = 20132129 is a prime.

It is a super-2 number, since 2×22229281² = 988281867553922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22229287) 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, 5976 + ... + 8953.

It is an arithmetic number, because the mean of its divisors is an integer number (5561425).

Almost surely, 2^22229281 is an apocalyptic number.

It is an amenable number.

22229281 is a deficient number, since it is larger than the sum of its proper divisors (16419).

22229281 is a wasteful number, since it uses less digits than its factorization.

22229281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16418.

The product of its digits is 2304, while the sum is 28.

The square root of 22229281 is about 4714.7938449099. The cubic root of 22229281 is about 281.1739866347.

The spelling of 22229281 in words is "twenty-two million, two hundred twenty-nine thousand, two hundred eighty-one".