121001212212221 has 16 divisors (see below), whose sum is σ = 132123672832320. Its totient is φ = 109899149575680.

The previous prime is 121001212212053. The next prime is 121001212212233. The reversal of 121001212212221 is 122212212100121.

It is a cyclic number.

It is not a de Polignac number, because 121001212212221 - 2¹⁰ = 121001212211197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121001212212193 and 121001212212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001212212721) 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, 439085645 + ... + 439361133.

It is an arithmetic number, because the mean of its divisors is an integer number (8257729552020).

Almost surely, 2^{121001212212221} is an apocalyptic number.

121001212212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121001212212221 is a deficient number, since it is larger than the sum of its proper divisors (11122460620099).

121001212212221 is a wasteful number, since it uses less digits than its factorization.

121001212212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312364.

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

Adding to 121001212212221 its reverse (122212212100121), we get a palindrome (243213424312342).

The spelling of 121001212212221 in words is "one hundred twenty-one trillion, one billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty-one".