121001001002221 has 12 divisors (see below), whose sum is σ = 128518063089852. Its totient is φ = 113902383726144.

The previous prime is 121001001002207. The next prime is 121001001002239. The reversal of 121001001002221 is 122200100100121.

It can be written as a sum of positive squares in 2 ways, for example, as 14509539921321 + 106491461080900 = 3809139^2 + 10319470^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121001001002221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001001005221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1067404560 + ... + 1067517913.

It is an arithmetic number, because the mean of its divisors is an integer number (10709838590821).

Almost surely, 2^{121001001002221} is an apocalyptic number.

It is an amenable number.

121001001002221 is a deficient number, since it is larger than the sum of its proper divisors (7517062087631).

121001001002221 is a wasteful number, since it uses less digits than its factorization.

121001001002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134922668 (or 2134922649 counting only the distinct ones).

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

Adding to 121001001002221 its reverse (122200100100121), we get a palindrome (243201101102342).

The spelling of 121001001002221 in words is "one hundred twenty-one trillion, one billion, one million, two thousand, two hundred twenty-one".