20212221011 has 2 divisors, whose sum is σ = 20212221012. Its totient is φ = 20212221010.

The previous prime is 20212220981. The next prime is 20212221013. The reversal of 20212221011 is 11012221202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20212221011 - 2²⁶ = 20145112147 is a prime.

It is a super-4 number, since 4×20212221011⁴ (a number of 42 digits) contains 4444 as substring.

Together with 20212221013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20212221013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106110505 + 10106110506.

It is an arithmetic number, because the mean of its divisors is an integer number (10106110506).

Almost surely, 2^20212221011 is an apocalyptic number.

20212221011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212221011 is an equidigital number, since it uses as much as digits as its factorization.

20212221011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20212221011 its reverse (11012221202), we get a palindrome (31224442213).

The spelling of 20212221011 in words is "twenty billion, two hundred twelve million, two hundred twenty-one thousand, eleven".