21896767 has 2 divisors, whose sum is σ = 21896768. Its totient is φ = 21896766.

The previous prime is 21896717. The next prime is 21896773. The reversal of 21896767 is 76769812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21896767 - 2⁷ = 21896639 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21896717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10948383 + 10948384.

It is an arithmetic number, because the mean of its divisors is an integer number (10948384).

Almost surely, 2^21896767 is an apocalyptic number.

21896767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21896767 is an equidigital number, since it uses as much as digits as its factorization.

21896767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 21896767 is about 4679.3981450610. The cubic root of 21896767 is about 279.7649685867.

The spelling of 21896767 in words is "twenty-one million, eight hundred ninety-six thousand, seven hundred sixty-seven".