221212201200121 has 4 divisors (see below), whose sum is σ = 221212321708432. Its totient is φ = 221212080691812.

The previous prime is 221212201200113. The next prime is 221212201200217. The reversal of 221212201200121 is 121002102212122.

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 221212201200121 - 2³ = 221212201200113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212201204121) 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, 57457395 + ... + 61186408.

It is an arithmetic number, because the mean of its divisors is an integer number (55303080427108).

Almost surely, 2^{221212201200121} is an apocalyptic number.

It is an amenable number.

221212201200121 is a deficient number, since it is larger than the sum of its proper divisors (120508311).

221212201200121 is a wasteful number, since it uses less digits than its factorization.

221212201200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120508310.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221212201200121 its reverse (121002102212122), we get a palindrome (342214303412243).

The spelling of 221212201200121 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred one million, two hundred thousand, one hundred twenty-one".