26718421 has 4 divisors (see below), whose sum is σ = 26731872. Its totient is φ = 26704972.

The previous prime is 26718409. The next prime is 26718451. The reversal of 26718421 is 12481762.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26718421 - 2⁹ = 26717909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26718401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3091 + ... + 7936.

It is an arithmetic number, because the mean of its divisors is an integer number (6682968).

Almost surely, 2^26718421 is an apocalyptic number.

It is an amenable number.

26718421 is a deficient number, since it is larger than the sum of its proper divisors (13451).

26718421 is a wasteful number, since it uses less digits than its factorization.

26718421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13450.

The product of its digits is 5376, while the sum is 31.

The square root of 26718421 is about 5168.9864577110. The cubic root of 26718421 is about 298.9534682980.

The spelling of 26718421 in words is "twenty-six million, seven hundred eighteen thousand, four hundred twenty-one".