20111021210999 has 2 divisors, whose sum is σ = 20111021211000. Its totient is φ = 20111021210998.

The previous prime is 20111021210939. The next prime is 20111021211011. The reversal of 20111021210999 is 99901212011102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111021210999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111021210939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055510605499 + 10055510605500.

It is an arithmetic number, because the mean of its divisors is an integer number (10055510605500).

Almost surely, 2^{20111021210999} is an apocalyptic number.

20111021210999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111021210999 is an equidigital number, since it uses as much as digits as its factorization.

20111021210999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 20111021210999 in words is "twenty trillion, one hundred eleven billion, twenty-one million, two hundred ten thousand, nine hundred ninety-nine".