121211210220221 has 32 divisors (see below), whose sum is σ = 136234615136256. Its totient is φ = 106887717936000.

The previous prime is 121211210220137. The next prime is 121211210220283. The reversal of 121211210220221 is 122022012112121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121211210220221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121211210220193 and 121211210220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211210280221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58503416 + ... + 60539838.

It is an arithmetic number, because the mean of its divisors is an integer number (4257331723008).

Almost surely, 2^{121211210220221} is an apocalyptic number.

121211210220221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121211210220221 is a deficient number, since it is larger than the sum of its proper divisors (15023404916035).

121211210220221 is a wasteful number, since it uses less digits than its factorization.

121211210220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037233.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121211210220221 its reverse (122022012112121), we get a palindrome (243233222332342).

The spelling of 121211210220221 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred ten million, two hundred twenty thousand, two hundred twenty-one".