202121021121109 has 2 divisors, whose sum is σ = 202121021121110. Its totient is φ = 202121021121108.

The previous prime is 202121021121091. The next prime is 202121021121137. The reversal of 202121021121109 is 901121120121202.

Together with previous prime (202121021121091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180823073020209 + 21297948100900 = 13447047^2 + 4614970^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121021121109 - 2⁵ = 202121021121077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202121021121139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060510560554 + 101060510560555.

It is an arithmetic number, because the mean of its divisors is an integer number (101060510560555).

Almost surely, 2^{202121021121109} is an apocalyptic number.

It is an amenable number.

202121021121109 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121021121109 is an equidigital number, since it uses as much as digits as its factorization.

202121021121109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 202121021121109 in words is "two hundred two trillion, one hundred twenty-one billion, twenty-one million, one hundred twenty-one thousand, one hundred nine".