221111212012201 has 4 divisors (see below), whose sum is σ = 252698528013952. Its totient is φ = 189523896010452.

The previous prime is 221111212012183. The next prime is 221111212012237. The reversal of 221111212012201 is 102210212111122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221111212012201 - 2¹⁵ = 221111211979433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221111212018201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15793658000865 + ... + 15793658000878.

It is an arithmetic number, because the mean of its divisors is an integer number (63174632003488).

Almost surely, 2^{221111212012201} is an apocalyptic number.

It is an amenable number.

221111212012201 is a deficient number, since it is larger than the sum of its proper divisors (31587316001751).

221111212012201 is an equidigital number, since it uses as much as digits as its factorization.

221111212012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31587316001750.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221111212012201 its reverse (102210212111122), we get a palindrome (323321424123323).

The spelling of 221111212012201 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twelve million, twelve thousand, two hundred one".