221221121012201 has 32 divisors (see below), whose sum is σ = 235472028480000. Its totient is φ = 207243815804928.

The previous prime is 221221121012183. The next prime is 221221121012251. The reversal of 221221121012201 is 102210121122122.

221221121012201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221221121012201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221221121012251) 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, 4590292361 + ... + 4590340553.

It is an arithmetic number, because the mean of its divisors is an integer number (7358500890000).

Almost surely, 2^{221221121012201} is an apocalyptic number.

It is an amenable number.

221221121012201 is a deficient number, since it is larger than the sum of its proper divisors (14250907467799).

221221121012201 is a wasteful number, since it uses less digits than its factorization.

221221121012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55553.

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

Adding to 221221121012201 its reverse (102210121122122), we get a palindrome (323431242134323).

The spelling of 221221121012201 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, twelve thousand, two hundred one".