20213310121 has 2 divisors, whose sum is σ = 20213310122. Its totient is φ = 20213310120.

The previous prime is 20213310101. The next prime is 20213310157. The reversal of 20213310121 is 12101331202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20152641600 + 60668521 = 141960^2 + 7789^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213310121 - 2²⁵ = 20179755689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20213310095 and 20213310104.

It is not a weakly prime, because it can be changed into another prime (20213310101) 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, 10106655060 + 10106655061.

It is an arithmetic number, because the mean of its divisors is an integer number (10106655061).

Almost surely, 2^20213310121 is an apocalyptic number.

It is an amenable number.

20213310121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213310121 is an equidigital number, since it uses as much as digits as its factorization.

20213310121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20213310121 its reverse (12101331202), we get a palindrome (32314641323).

The spelling of 20213310121 in words is "twenty billion, two hundred thirteen million, three hundred ten thousand, one hundred twenty-one".