21025227048461 has 2 divisors, whose sum is σ = 21025227048462. Its totient is φ = 21025227048460.

The previous prime is 21025227048439. The next prime is 21025227048523. The reversal of 21025227048461 is 16484072252012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20789778895561 + 235448152900 = 4559581^2 + 485230^2 .

It is a cyclic number.

It is not a de Polignac number, because 21025227048461 - 2³⁸ = 20750349141517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21025227048361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512613524230 + 10512613524231.

It is an arithmetic number, because the mean of its divisors is an integer number (10512613524231).

Almost surely, 2^{21025227048461} is an apocalyptic number.

It is an amenable number.

21025227048461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21025227048461 is an equidigital number, since it uses as much as digits as its factorization.

21025227048461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 430080, while the sum is 44.

The spelling of 21025227048461 in words is "twenty-one trillion, twenty-five billion, two hundred twenty-seven million, forty-eight thousand, four hundred sixty-one".