26221687 has 2 divisors, whose sum is σ = 26221688. Its totient is φ = 26221686.

The previous prime is 26221681. The next prime is 26221693. The reversal of 26221687 is 78612262.

It is a balanced prime because it is at equal distance from previous prime (26221681) and next prime (26221693).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26221687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26221681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13110843 + 13110844.

It is an arithmetic number, because the mean of its divisors is an integer number (13110844).

Almost surely, 2^26221687 is an apocalyptic number.

26221687 is a deficient number, since it is larger than the sum of its proper divisors (1).

26221687 is an equidigital number, since it uses as much as digits as its factorization.

26221687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 26221687 is about 5120.7115716470. The cubic root of 26221687 is about 297.0892082388.

The spelling of 26221687 in words is "twenty-six million, two hundred twenty-one thousand, six hundred eighty-seven".