21926887 has 2 divisors, whose sum is σ = 21926888. Its totient is φ = 21926886.

The previous prime is 21926873. The next prime is 21926897. The reversal of 21926887 is 78862912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21926887 - 2¹¹ = 21924839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21926867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10963443 + 10963444.

It is an arithmetic number, because the mean of its divisors is an integer number (10963444).

Almost surely, 2^21926887 is an apocalyptic number.

21926887 is a deficient number, since it is larger than the sum of its proper divisors (1).

21926887 is an equidigital number, since it uses as much as digits as its factorization.

21926887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 21926887 is about 4682.6154016746. The cubic root of 21926887 is about 279.8931862990.

The spelling of 21926887 in words is "twenty-one million, nine hundred twenty-six thousand, eight hundred eighty-seven".