26250821 has 2 divisors, whose sum is σ = 26250822. Its totient is φ = 26250820.

The previous prime is 26250803. The next prime is 26250823. The reversal of 26250821 is 12805262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15288100 + 10962721 = 3910^2 + 3311^2 .

It is a cyclic number.

It is not a de Polignac number, because 26250821 - 2¹⁴ = 26234437 is a prime.

Together with 26250823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26250823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13125410 + 13125411.

It is an arithmetic number, because the mean of its divisors is an integer number (13125411).

Almost surely, 2^26250821 is an apocalyptic number.

It is an amenable number.

26250821 is a deficient number, since it is larger than the sum of its proper divisors (1).

26250821 is an equidigital number, since it uses as much as digits as its factorization.

26250821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 26250821 is about 5123.5555037493. Note that the first 4 decimals coincide. The cubic root of 26250821 is about 297.1991959931.

The spelling of 26250821 in words is "twenty-six million, two hundred fifty thousand, eight hundred twenty-one".