20213331121 has 2 divisors, whose sum is σ = 20213331122. Its totient is φ = 20213331120.

The previous prime is 20213331119. The next prime is 20213331133. The reversal of 20213331121 is 12113331202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14959980721 + 5253350400 = 122311^2 + 72480^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213331121 - 2¹ = 20213331119 is a prime.

Together with 20213331119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20213331101) 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, 10106665560 + 10106665561.

It is an arithmetic number, because the mean of its divisors is an integer number (10106665561).

Almost surely, 2^20213331121 is an apocalyptic number.

It is an amenable number.

20213331121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213331121 is an equidigital number, since it uses as much as digits as its factorization.

20213331121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20213331121 its reverse (12113331202), we get a palindrome (32326662323).

The spelling of 20213331121 in words is "twenty billion, two hundred thirteen million, three hundred thirty-one thousand, one hundred twenty-one".