22271981 has 8 divisors (see below), whose sum is σ = 23990784. Its totient is φ = 20615760.

The previous prime is 22271927. The next prime is 22271987. The reversal of 22271981 is 18917222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22271981 - 2¹⁰ = 22270957 is a prime.

It is a super-2 number, since 2×22271981² = 992082275328722, which contains 22 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 (22271987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14906 + ... + 16331.

It is an arithmetic number, because the mean of its divisors is an integer number (2998848).

Almost surely, 2^22271981 is an apocalyptic number.

It is an amenable number.

22271981 is a deficient number, since it is larger than the sum of its proper divisors (1718803).

22271981 is a wasteful number, since it uses less digits than its factorization.

22271981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31291.

The product of its digits is 4032, while the sum is 32.

The square root of 22271981 is about 4719.3199721994. The cubic root of 22271981 is about 281.3539062332.

The spelling of 22271981 in words is "twenty-two million, two hundred seventy-one thousand, nine hundred eighty-one".