21850867 has 2 divisors, whose sum is σ = 21850868. Its totient is φ = 21850866.

The previous prime is 21850853. The next prime is 21850883. The reversal of 21850867 is 76805812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21850867 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21854867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10925433 + 10925434.

It is an arithmetic number, because the mean of its divisors is an integer number (10925434).

Almost surely, 2^21850867 is an apocalyptic number.

21850867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21850867 is an equidigital number, since it uses as much as digits as its factorization.

21850867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 21850867 is about 4674.4910952958. The cubic root of 21850867 is about 279.5693507419.

The spelling of 21850867 in words is "twenty-one million, eight hundred fifty thousand, eight hundred sixty-seven".