1899999021211 has 2 divisors, whose sum is σ = 1899999021212. Its totient is φ = 1899999021210.

The previous prime is 1899999021161. The next prime is 1899999021223. The reversal of 1899999021211 is 1121209999981.

It is a strong prime.

It is an emirp because it is prime and its reverse (1121209999981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1899999021211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1899999021211.

It is not a weakly prime, because it can be changed into another prime (1899999021251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949999510605 + 949999510606.

It is an arithmetic number, because the mean of its divisors is an integer number (949999510606).

Almost surely, 2^{1899999021211} is an apocalyptic number.

1899999021211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1899999021211 is an equidigital number, since it uses as much as digits as its factorization.

1899999021211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 61.

The spelling of 1899999021211 in words is "one trillion, eight hundred ninety-nine billion, nine hundred ninety-nine million, twenty-one thousand, two hundred eleven".