221121200222121 has 16 divisors (see below), whose sum is σ = 295015813260480. Its totient is φ = 147320369871360.

The previous prime is 221121200221997. The next prime is 221121200222137. The reversal of 221121200222121 is 121222002121122.

It is not a de Polignac number, because 221121200222121 - 2¹⁵ = 221121200189353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221121200224121) 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, 92319601 + ... + 94684481.

It is an arithmetic number, because the mean of its divisors is an integer number (18438488328780).

Almost surely, 2^{221121200222121} is an apocalyptic number.

It is an amenable number.

221121200222121 is a deficient number, since it is larger than the sum of its proper divisors (73894613038359).

221121200222121 is a wasteful number, since it uses less digits than its factorization.

221121200222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384696.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221121200222121 its reverse (121222002121122), we get a palindrome (342343202343243).

The spelling of 221121200222121 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred million, two hundred twenty-two thousand, one hundred twenty-one".