26821057 has 2 divisors, whose sum is σ = 26821058. Its totient is φ = 26821056.

The previous prime is 26821049. The next prime is 26821061. The reversal of 26821057 is 75012862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 6471936 = 4511^2 + 2544^2 .

It is a cyclic number.

It is not a de Polignac number, because 26821057 - 2³ = 26821049 is a prime.

It is not a weakly prime, because it can be changed into another prime (26821037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13410528 + 13410529.

It is an arithmetic number, because the mean of its divisors is an integer number (13410529).

Almost surely, 2^26821057 is an apocalyptic number.

It is an amenable number.

26821057 is a deficient number, since it is larger than the sum of its proper divisors (1).

26821057 is an equidigital number, since it uses as much as digits as its factorization.

26821057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 26821057 is about 5178.9050000941. The cubic root of 26821057 is about 299.3357785999.

The spelling of 26821057 in words is "twenty-six million, eight hundred twenty-one thousand, fifty-seven".