1290118404821 has 2 divisors, whose sum is σ = 1290118404822. Its totient is φ = 1290118404820.

The previous prime is 1290118404781. The next prime is 1290118404851. The reversal of 1290118404821 is 1284048110921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 863624510596 + 426493894225 = 929314^2 + 653065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290118404821 - 2²⁶ = 1290051295957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290118404851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645059202410 + 645059202411.

It is an arithmetic number, because the mean of its divisors is an integer number (645059202411).

Almost surely, 2^{1290118404821} is an apocalyptic number.

It is an amenable number.

1290118404821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290118404821 is an equidigital number, since it uses as much as digits as its factorization.

1290118404821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 41.

The spelling of 1290118404821 in words is "one trillion, two hundred ninety billion, one hundred eighteen million, four hundred four thousand, eight hundred twenty-one".