21846893 has 2 divisors, whose sum is σ = 21846894. Its totient is φ = 21846892.

The previous prime is 21846883. The next prime is 21846899. The reversal of 21846893 is 39864812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21557449 + 289444 = 4643^2 + 538^2 .

It is a cyclic number.

It is not a de Polignac number, because 21846893 - 2¹² = 21842797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21846893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21846899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10923446 + 10923447.

It is an arithmetic number, because the mean of its divisors is an integer number (10923447).

Almost surely, 2^21846893 is an apocalyptic number.

It is an amenable number.

21846893 is a deficient number, since it is larger than the sum of its proper divisors (1).

21846893 is an equidigital number, since it uses as much as digits as its factorization.

21846893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 21846893 is about 4674.0660029572. The cubic root of 21846893 is about 279.5524013616.

The spelling of 21846893 in words is "twenty-one million, eight hundred forty-six thousand, eight hundred ninety-three".