1021225356461 has 2 divisors, whose sum is σ = 1021225356462. Its totient is φ = 1021225356460.

The previous prime is 1021225356391. The next prime is 1021225356467. The reversal of 1021225356461 is 1646535221201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 885304100836 + 135921255625 = 940906^2 + 368675^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021225356461 - 2¹⁴ = 1021225340077 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 (1021225356467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510612678230 + 510612678231.

It is an arithmetic number, because the mean of its divisors is an integer number (510612678231).

Almost surely, 2^{1021225356461} is an apocalyptic number.

It is an amenable number.

1021225356461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021225356461 is an equidigital number, since it uses as much as digits as its factorization.

1021225356461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 1021225356461 in words is "one trillion, twenty-one billion, two hundred twenty-five million, three hundred fifty-six thousand, four hundred sixty-one".