121202021202221 has 2 divisors, whose sum is σ = 121202021202222. Its totient is φ = 121202021202220.

The previous prime is 121202021202217. The next prime is 121202021202239. The reversal of 121202021202221 is 122202120202121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118744369266121 + 2457651936100 = 10896989^2 + 1567690^2 .

It is a cyclic number.

It is not a de Polignac number, because 121202021202221 - 2² = 121202021202217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121202021202193 and 121202021202202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121202021202271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60601010601110 + 60601010601111.

It is an arithmetic number, because the mean of its divisors is an integer number (60601010601111).

Almost surely, 2^{121202021202221} is an apocalyptic number.

It is an amenable number.

121202021202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121202021202221 is an equidigital number, since it uses as much as digits as its factorization.

121202021202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121202021202221 its reverse (122202120202121), we get a palindrome (243404141404342).

The spelling of 121202021202221 in words is "one hundred twenty-one trillion, two hundred two billion, twenty-one million, two hundred two thousand, two hundred twenty-one".