20102202121 has 2 divisors, whose sum is σ = 20102202122. Its totient is φ = 20102202120.

The previous prime is 20102202091. The next prime is 20102202151. The reversal of 20102202121 is 12120220102.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20102202091) and next prime (20102202151).

It can be written as a sum of positive squares in only one way, i.e., 17203994896 + 2898207225 = 131164^2 + 53835^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102202121 - 2³¹ = 17954718473 is a prime.

It is a super-2 number, since 2×20102202121² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20102202151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051101060 + 10051101061.

It is an arithmetic number, because the mean of its divisors is an integer number (10051101061).

Almost surely, 2^20102202121 is an apocalyptic number.

It is an amenable number.

20102202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102202121 is an equidigital number, since it uses as much as digits as its factorization.

20102202121 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 13.

Adding to 20102202121 its reverse (12120220102), we get a palindrome (32222422223).

The spelling of 20102202121 in words is "twenty billion, one hundred two million, two hundred two thousand, one hundred twenty-one".