26425787221 has 2 divisors, whose sum is σ = 26425787222. Its totient is φ = 26425787220.

The previous prime is 26425787197. The next prime is 26425787231. The reversal of 26425787221 is 12278752462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15453224721 + 10972562500 = 124311^2 + 104750^2 .

It is a cyclic number.

It is not a de Polignac number, because 26425787221 - 2¹⁹ = 26425262933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26425787231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13212893610 + 13212893611.

It is an arithmetic number, because the mean of its divisors is an integer number (13212893611).

Almost surely, 2^26425787221 is an apocalyptic number.

It is an amenable number.

26425787221 is a deficient number, since it is larger than the sum of its proper divisors (1).

26425787221 is an equidigital number, since it uses as much as digits as its factorization.

26425787221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 46.

The spelling of 26425787221 in words is "twenty-six billion, four hundred twenty-five million, seven hundred eighty-seven thousand, two hundred twenty-one".