26421631 has 4 divisors (see below), whose sum is σ = 26547064. Its totient is φ = 26296200.

The previous prime is 26421611. The next prime is 26421643. The reversal of 26421631 is 13612462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13612462 = 2 ⋅6806231.

It is a cyclic number.

It is not a de Polignac number, because 26421631 - 2⁵ = 26421599 is a prime.

It is a super-2 number, since 2×26421631² = 1396205169400322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26421596 and 26421605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26421611) 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, 62400 + ... + 62821.

It is an arithmetic number, because the mean of its divisors is an integer number (6636766).

Almost surely, 2^26421631 is an apocalyptic number.

26421631 is a deficient number, since it is larger than the sum of its proper divisors (125433).

26421631 is a wasteful number, since it uses less digits than its factorization.

26421631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125432.

The product of its digits is 1728, while the sum is 25.

The square root of 26421631 is about 5140.1975642965. The cubic root of 26421631 is about 297.8424125133.

The spelling of 26421631 in words is "twenty-six million, four hundred twenty-one thousand, six hundred thirty-one".