22157881 has 8 divisors (see below), whose sum is σ = 22524480. Its totient is φ = 21794448.

The previous prime is 22157879. The next prime is 22157897. The reversal of 22157881 is 18875122.

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 22157881 - 2¹ = 22157879 is a prime.

It is a super-2 number, since 2×22157881² = 981943380820322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22157081) 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 7 ways as a sum of consecutive naturals, for example, 16140 + ... + 17458.

It is an arithmetic number, because the mean of its divisors is an integer number (2815560).

Almost surely, 2^22157881 is an apocalyptic number.

It is an amenable number.

22157881 is a deficient number, since it is larger than the sum of its proper divisors (366599).

22157881 is a wasteful number, since it uses less digits than its factorization.

22157881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its digits is 8960, while the sum is 34.

The square root of 22157881 is about 4707.2158437871. The cubic root of 22157881 is about 280.8726220297.

The spelling of 22157881 in words is "twenty-two million, one hundred fifty-seven thousand, eight hundred eighty-one".