121210102011221 has 2 divisors, whose sum is σ = 121210102011222. Its totient is φ = 121210102011220.

The previous prime is 121210102011137. The next prime is 121210102011307. The reversal of 121210102011221 is 122110201012121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68612230562500 + 52597871448721 = 8283250^2 + 7252439^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210102011221 - 2³⁰ = 121209028269397 is a prime.

It is a super-2 number, since 2×121210102011221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121210102011221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210102011121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605051005610 + 60605051005611.

It is an arithmetic number, because the mean of its divisors is an integer number (60605051005611).

Almost surely, 2^{121210102011221} is an apocalyptic number.

It is an amenable number.

121210102011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210102011221 is an equidigital number, since it uses as much as digits as its factorization.

121210102011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121210102011221 its reverse (122110201012121), we get a palindrome (243320303023342).

The spelling of 121210102011221 in words is "one hundred twenty-one trillion, two hundred ten billion, one hundred two million, eleven thousand, two hundred twenty-one".