200111220121 has 2 divisors, whose sum is σ = 200111220122. Its totient is φ = 200111220120.

The previous prime is 200111220091. The next prime is 200111220137. The reversal of 200111220121 is 121022111002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198969523600 + 1141696521 = 446060^2 + 33789^2 .

It is a cyclic number.

It is not a de Polignac number, because 200111220121 - 2¹³ = 200111211929 is a prime.

It is not a weakly prime, because it can be changed into another prime (200111224121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100055610060 + 100055610061.

It is an arithmetic number, because the mean of its divisors is an integer number (100055610061).

Almost surely, 2^200111220121 is an apocalyptic number.

It is an amenable number.

200111220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

200111220121 is an equidigital number, since it uses as much as digits as its factorization.

200111220121 is an evil number, because the sum of its binary digits is even.

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

Adding to 200111220121 its reverse (121022111002), we get a palindrome (321133331123).

The spelling of 200111220121 in words is "two hundred billion, one hundred eleven million, two hundred twenty thousand, one hundred twenty-one".