26921431 has 4 divisors (see below), whose sum is σ = 28091952. Its totient is φ = 25750912.

The previous prime is 26921407. The next prime is 26921441. The reversal of 26921431 is 13412962.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13412962 = 2 ⋅6706481.

It is a cyclic number.

It is not a de Polignac number, because 26921431 - 2⁵ = 26921399 is a prime.

It is a super-2 number, since 2×26921431² = 1449526894175522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26921431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26921441) 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, 585226 + ... + 585271.

It is an arithmetic number, because the mean of its divisors is an integer number (7022988).

Almost surely, 2^26921431 is an apocalyptic number.

26921431 is a deficient number, since it is larger than the sum of its proper divisors (1170521).

26921431 is a wasteful number, since it uses less digits than its factorization.

26921431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170520.

The product of its digits is 2592, while the sum is 28.

The square root of 26921431 is about 5188.5866090873. The cubic root of 26921431 is about 299.7087209837.

The spelling of 26921431 in words is "twenty-six million, nine hundred twenty-one thousand, four hundred thirty-one".