20312202121 has 2 divisors, whose sum is σ = 20312202122. Its totient is φ = 20312202120.

The previous prime is 20312202107. The next prime is 20312202133. The reversal of 20312202121 is 12120221302.

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., 20267793225 + 44408896 = 142365^2 + 6664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312202121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20312202095 and 20312202104.

It is not a weakly prime, because it can be changed into another prime (20312202101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156101060 + 10156101061.

It is an arithmetic number, because the mean of its divisors is an integer number (10156101061).

Almost surely, 2^20312202121 is an apocalyptic number.

It is an amenable number.

20312202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312202121 is an equidigital number, since it uses as much as digits as its factorization.

20312202121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20312202121 its reverse (12120221302), we get a palindrome (32432423423).

The spelling of 20312202121 in words is "twenty billion, three hundred twelve million, two hundred two thousand, one hundred twenty-one".