26121421 has 8 divisors (see below), whose sum is σ = 26893944. Its totient is φ = 25359360.

The previous prime is 26121413. The next prime is 26121439. The reversal of 26121421 is 12412162.

It can be written as a sum of positive squares in 4 ways, for example, as 1974025 + 24147396 = 1405^2 + 4914^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26121421 - 2³ = 26121413 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 (26121461) 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 7 ways as a sum of consecutive naturals, for example, 2601 + ... + 7681.

It is an arithmetic number, because the mean of its divisors is an integer number (3361743).

Almost surely, 2^26121421 is an apocalyptic number.

It is an amenable number.

26121421 is a deficient number, since it is larger than the sum of its proper divisors (772523).

26121421 is an equidigital number, since it uses as much as digits as its factorization.

26121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5231.

The product of its digits is 192, while the sum is 19.

The square root of 26121421 is about 5110.9119538493. The cubic root of 26121421 is about 296.7100564964.

Adding to 26121421 its reverse (12412162), we get a palindrome (38533583).

The spelling of 26121421 in words is "twenty-six million, one hundred twenty-one thousand, four hundred twenty-one".