1295027207821 has 2 divisors, whose sum is σ = 1295027207822. Its totient is φ = 1295027207820.

The previous prime is 1295027207809. The next prime is 1295027207921. The reversal of 1295027207821 is 1287027205921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 715927515625 + 579099692196 = 846125^2 + 760986^2 .

It is an emirp because it is prime and its reverse (1287027205921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1295027207821 - 2¹³ = 1295027199629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1295027207521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647513603910 + 647513603911.

It is an arithmetic number, because the mean of its divisors is an integer number (647513603911).

Almost surely, 2^{1295027207821} is an apocalyptic number.

It is an amenable number.

1295027207821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1295027207821 is an equidigital number, since it uses as much as digits as its factorization.

1295027207821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 1295027207821 in words is "one trillion, two hundred ninety-five billion, twenty-seven million, two hundred seven thousand, eight hundred twenty-one".