221211212200121 has 8 divisors (see below), whose sum is σ = 259884501046464. Its totient is φ = 185631786461520.

The previous prime is 221211212200087. The next prime is 221211212200129. The reversal of 221211212200121 is 121002212112122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221211212200121 - 2¹⁸ = 221211211937977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221211212200093 and 221211212200102.

It is not an unprimeable number, because it can be changed into a prime (221211212200129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773465776781 + ... + 773465777066.

It is an arithmetic number, because the mean of its divisors is an integer number (32485562630808).

Almost surely, 2^{221211212200121} is an apocalyptic number.

It is an amenable number.

221211212200121 is a deficient number, since it is larger than the sum of its proper divisors (38673288846343).

221211212200121 is a wasteful number, since it uses less digits than its factorization.

221211212200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546931553871.

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

Adding to 221211212200121 its reverse (121002212112122), we get a palindrome (342213424312243).

The spelling of 221211212200121 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twelve million, two hundred thousand, one hundred twenty-one".