121021212020221 has 2 divisors, whose sum is σ = 121021212020222. Its totient is φ = 121021212020220.

The previous prime is 121021212020143. The next prime is 121021212020237. The reversal of 121021212020221 is 122020212120121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64044967896100 + 56976244124121 = 8002810^2 + 7548261^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021212020221 - 2⁹ = 121021212019709 is a prime.

It is a super-2 number, since 2×121021212020221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121021212020281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510606010110 + 60510606010111.

It is an arithmetic number, because the mean of its divisors is an integer number (60510606010111).

Almost surely, 2^{121021212020221} is an apocalyptic number.

It is an amenable number.

121021212020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021212020221 is an equidigital number, since it uses as much as digits as its factorization.

121021212020221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121021212020221 its reverse (122020212120121), we get a palindrome (243041424140342).

The spelling of 121021212020221 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred twelve million, twenty thousand, two hundred twenty-one".