20021101111211 has 2 divisors, whose sum is σ = 20021101111212. Its totient is φ = 20021101111210.

The previous prime is 20021101111201. The next prime is 20021101111223. The reversal of 20021101111211 is 11211110112002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021101111211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20021101111201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010550555605 + 10010550555606.

It is an arithmetic number, because the mean of its divisors is an integer number (10010550555606).

Almost surely, 2^{20021101111211} is an apocalyptic number.

20021101111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021101111211 is an equidigital number, since it uses as much as digits as its factorization.

20021101111211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20021101111211 its reverse (11211110112002), we get a palindrome (31232211223213).

The spelling of 20021101111211 in words is "twenty trillion, twenty-one billion, one hundred one million, one hundred eleven thousand, two hundred eleven".