22191427 has 2 divisors, whose sum is σ = 22191428. Its totient is φ = 22191426.

The previous prime is 22191401. The next prime is 22191451. The reversal of 22191427 is 72419122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22191427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22191395 and 22191404.

It is not a weakly prime, because it can be changed into another prime (22194427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11095713 + 11095714.

It is an arithmetic number, because the mean of its divisors is an integer number (11095714).

Almost surely, 2^22191427 is an apocalyptic number.

22191427 is a deficient number, since it is larger than the sum of its proper divisors (1).

22191427 is an equidigital number, since it uses as much as digits as its factorization.

22191427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 22191427 is about 4710.7777489497. Note that the first 4 decimals coincide. The cubic root of 22191427 is about 281.0142932493.

The spelling of 22191427 in words is "twenty-two million, one hundred ninety-one thousand, four hundred twenty-seven".