19800211 has 2 divisors, whose sum is σ = 19800212. Its totient is φ = 19800210.

The previous prime is 19800203. The next prime is 19800229. The reversal of 19800211 is 11200891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19800211 - 2³ = 19800203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19800241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9900105 + 9900106.

It is an arithmetic number, because the mean of its divisors is an integer number (9900106).

Almost surely, 2^19800211 is an apocalyptic number.

19800211 is a deficient number, since it is larger than the sum of its proper divisors (1).

19800211 is an equidigital number, since it uses as much as digits as its factorization.

19800211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 19800211 is about 4449.7428015561. The cubic root of 19800211 is about 270.5348838836.

The spelling of 19800211 in words is "nineteen million, eight hundred thousand, two hundred eleven".