22131881 has 2 divisors, whose sum is σ = 22131882. Its totient is φ = 22131880.

The previous prime is 22131871. The next prime is 22131887. The reversal of 22131881 is 18813122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13808656 + 8323225 = 3716^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 22131881 - 2⁶ = 22131817 is a prime.

It is a super-2 number, since 2×22131881² = 979640313196322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22131881.

It is not a weakly prime, because it can be changed into another prime (22131887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11065940 + 11065941.

It is an arithmetic number, because the mean of its divisors is an integer number (11065941).

Almost surely, 2^22131881 is an apocalyptic number.

It is an amenable number.

22131881 is a deficient number, since it is larger than the sum of its proper divisors (1).

22131881 is an equidigital number, since it uses as much as digits as its factorization.

22131881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 26.

The square root of 22131881 is about 4704.4533157424. The cubic root of 22131881 is about 280.7627206308.

The spelling of 22131881 in words is "twenty-two million, one hundred thirty-one thousand, eight hundred eighty-one".