20021211211 has 2 divisors, whose sum is σ = 20021211212. Its totient is φ = 20021211210.

The previous prime is 20021211167. The next prime is 20021211239. The reversal of 20021211211 is 11211212002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021211211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021211191 and 20021211200.

It is not a weakly prime, because it can be changed into another prime (20021211251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010605605 + 10010605606.

It is an arithmetic number, because the mean of its divisors is an integer number (10010605606).

Almost surely, 2^20021211211 is an apocalyptic number.

20021211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021211211 is an equidigital number, since it uses as much as digits as its factorization.

20021211211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20021211211 its reverse (11211212002), we get a palindrome (31232423213).

The spelling of 20021211211 in words is "twenty billion, twenty-one million, two hundred eleven thousand, two hundred eleven".