22211281 has 4 divisors (see below), whose sum is σ = 22360500. Its totient is φ = 22062064.

The previous prime is 22211279. The next prime is 22211327. The reversal of 22211281 is 18211222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18211222 = 2 ⋅9105611.

It can be written as a sum of positive squares in 2 ways, for example, as 5564881 + 16646400 = 2359^2 + 4080^2 .

It is a cyclic number.

It is not a de Polignac number, because 22211281 - 2¹ = 22211279 is a prime.

It is a super-2 number, since 2×22211281² = 986682007321922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22211201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74386 + ... + 74683.

It is an arithmetic number, because the mean of its divisors is an integer number (5590125).

Almost surely, 2^22211281 is an apocalyptic number.

It is an amenable number.

22211281 is a deficient number, since it is larger than the sum of its proper divisors (149219).

22211281 is a wasteful number, since it uses less digits than its factorization.

22211281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149218.

The product of its digits is 128, while the sum is 19.

The square root of 22211281 is about 4712.8845731675. The cubic root of 22211281 is about 281.0980732715.

The spelling of 22211281 in words is "twenty-two million, two hundred eleven thousand, two hundred eighty-one".