22686421 has 2 divisors, whose sum is σ = 22686422. Its totient is φ = 22686420.

The previous prime is 22686403. The next prime is 22686431. The reversal of 22686421 is 12468622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22515025 + 171396 = 4745^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 22686421 - 2¹¹ = 22684373 is a prime.

It is a Chen prime.

It is equal to p_1429690 and since 22686421 and 1429690 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22686431) 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 as a sum of consecutive naturals, namely, 11343210 + 11343211.

It is an arithmetic number, because the mean of its divisors is an integer number (11343211).

Almost surely, 2^22686421 is an apocalyptic number.

It is an amenable number.

22686421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22686421 is an equidigital number, since it uses as much as digits as its factorization.

22686421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 22686421 is about 4763.0264538421. The cubic root of 22686421 is about 283.0883490966.

The spelling of 22686421 in words is "twenty-two million, six hundred eighty-six thousand, four hundred twenty-one".