20110222021 has 2 divisors, whose sum is σ = 20110222022. Its totient is φ = 20110222020.

The previous prime is 20110222007. The next prime is 20110222037. The reversal of 20110222021 is 12022201102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16779316225 + 3330905796 = 129535^2 + 57714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110222021 - 2¹¹ = 20110219973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20110221992 and 20110222010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110222621) 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, 10055111010 + 10055111011.

It is an arithmetic number, because the mean of its divisors is an integer number (10055111011).

Almost surely, 2^20110222021 is an apocalyptic number.

It is an amenable number.

20110222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110222021 is an equidigital number, since it uses as much as digits as its factorization.

20110222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20110222021 its reverse (12022201102), we get a palindrome (32132423123).

The spelling of 20110222021 in words is "twenty billion, one hundred ten million, two hundred twenty-two thousand, twenty-one".