20010222121 has 2 divisors, whose sum is σ = 20010222122. Its totient is φ = 20010222120.

The previous prime is 20010222109. The next prime is 20010222131. The reversal of 20010222121 is 12122201002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18840582121 + 1169640000 = 137261^2 + 34200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010222121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20010222131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005111060 + 10005111061.

It is an arithmetic number, because the mean of its divisors is an integer number (10005111061).

Almost surely, 2^20010222121 is an apocalyptic number.

It is an amenable number.

20010222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010222121 is an equidigital number, since it uses as much as digits as its factorization.

20010222121 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 20010222121 its reverse (12122201002), we get a palindrome (32132423123).

The spelling of 20010222121 in words is "twenty billion, ten million, two hundred twenty-two thousand, one hundred twenty-one".