26491421 has 4 divisors (see below), whose sum is σ = 28899744. Its totient is φ = 24083100.

The previous prime is 26491417. The next prime is 26491427. The reversal of 26491421 is 12419462.

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 26491421 - 2² = 26491417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26491427) 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, 1204145 + ... + 1204166.

It is an arithmetic number, because the mean of its divisors is an integer number (7224936).

Almost surely, 2^26491421 is an apocalyptic number.

It is an amenable number.

26491421 is a deficient number, since it is larger than the sum of its proper divisors (2408323).

26491421 is a wasteful number, since it uses less digits than its factorization.

26491421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408322.

The product of its digits is 3456, while the sum is 29.

The square root of 26491421 is about 5146.9817369017. The cubic root of 26491421 is about 298.1044219132.

The spelling of 26491421 in words is "twenty-six million, four hundred ninety-one thousand, four hundred twenty-one".