1921201892287 has 2 divisors, whose sum is σ = 1921201892288. Its totient is φ = 1921201892286.

The previous prime is 1921201892263. The next prime is 1921201892327. The reversal of 1921201892287 is 7822981021291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1921201892287 - 2¹⁹ = 1921201367999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921201892227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960600946143 + 960600946144.

It is an arithmetic number, because the mean of its divisors is an integer number (960600946144).

Almost surely, 2^{1921201892287} is an apocalyptic number.

1921201892287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921201892287 is an equidigital number, since it uses as much as digits as its factorization.

1921201892287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 52.

The spelling of 1921201892287 in words is "one trillion, nine hundred twenty-one billion, two hundred one million, eight hundred ninety-two thousand, two hundred eighty-seven".