121201202122221 has 16 divisors (see below), whose sum is σ = 179646446819840. Its totient is φ = 72179375952960.

The previous prime is 121201202122219. The next prime is 121201202122229. The reversal of 121201202122221 is 122221202102121.

It is not a de Polignac number, because 121201202122221 - 2¹ = 121201202122219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201202122229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50124565426 + ... + 50124567843.

It is an arithmetic number, because the mean of its divisors is an integer number (11227902926240).

Almost surely, 2^{121201202122221} is an apocalyptic number.

It is an amenable number.

121201202122221 is a deficient number, since it is larger than the sum of its proper divisors (58445244697619).

121201202122221 is a wasteful number, since it uses less digits than its factorization.

121201202122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100249133316.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 121201202122221 its reverse (122221202102121), we get a palindrome (243422404224342).

The spelling of 121201202122221 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred two million, one hundred twenty-two thousand, two hundred twenty-one".