26221987 has 4 divisors (see below), whose sum is σ = 28605816. Its totient is φ = 23838160.

The previous prime is 26221969. The next prime is 26221997. The reversal of 26221987 is 78912262.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26221987 - 2²³ = 17833379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26221907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191898 + ... + 1191919.

It is an arithmetic number, because the mean of its divisors is an integer number (7151454).

Almost surely, 2^26221987 is an apocalyptic number.

26221987 is a deficient number, since it is larger than the sum of its proper divisors (2383829).

26221987 is a wasteful number, since it uses less digits than its factorization.

26221987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383828.

The product of its digits is 24192, while the sum is 37.

The square root of 26221987 is about 5120.7408643672. The cubic root of 26221987 is about 297.0903412249.

The spelling of 26221987 in words is "twenty-six million, two hundred twenty-one thousand, nine hundred eighty-seven".