21211202201999 has 2 divisors, whose sum is σ = 21211202202000. Its totient is φ = 21211202201998.

The previous prime is 21211202201989. The next prime is 21211202202079. The reversal of 21211202201999 is 99910220211212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211202201999 - 2⁸ = 21211202201743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211202201989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605601100999 + 10605601101000.

It is an arithmetic number, because the mean of its divisors is an integer number (10605601101000).

Almost surely, 2^{21211202201999} is an apocalyptic number.

21211202201999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211202201999 is an equidigital number, since it uses as much as digits as its factorization.

21211202201999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 21211202201999 in words is "twenty-one trillion, two hundred eleven billion, two hundred two million, two hundred one thousand, nine hundred ninety-nine".