26401421 has 4 divisors (see below), whose sum is σ = 26773344. Its totient is φ = 26029500.

The previous prime is 26401411. The next prime is 26401423. The reversal of 26401421 is 12410462.

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 26401421 - 2¹⁰ = 26400397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26401393 and 26401402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26401423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185855 + ... + 185996.

It is an arithmetic number, because the mean of its divisors is an integer number (6693336).

Almost surely, 2^26401421 is an apocalyptic number.

It is an amenable number.

26401421 is a deficient number, since it is larger than the sum of its proper divisors (371923).

26401421 is an equidigital number, since it uses as much as digits as its factorization.

26401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371922.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 26401421 is about 5138.2313104803. The cubic root of 26401421 is about 297.7664529007.

Adding to 26401421 its reverse (12410462), we get a palindrome (38811883).

The spelling of 26401421 in words is "twenty-six million, four hundred one thousand, four hundred twenty-one".