1020200112121 has 2 divisors, whose sum is σ = 1020200112122. Its totient is φ = 1020200112120.

The previous prime is 1020200112101. The next prime is 1020200112157. The reversal of 1020200112121 is 1212110020201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 856874205625 + 163325906496 = 925675^2 + 404136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020200112121 - 2⁷ = 1020200111993 is a prime.

It is a super-2 number, since 2×1020200112121² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1020200112101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510100056060 + 510100056061.

It is an arithmetic number, because the mean of its divisors is an integer number (510100056061).

Almost surely, 2^{1020200112121} is an apocalyptic number.

It is an amenable number.

1020200112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020200112121 is an equidigital number, since it uses as much as digits as its factorization.

1020200112121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1020200112121 its reverse (1212110020201), we get a palindrome (2232310132322).

The spelling of 1020200112121 in words is "one trillion, twenty billion, two hundred million, one hundred twelve thousand, one hundred twenty-one".