2221121210121 has 32 divisors (see below), whose sum is σ = 3594548697600. Its totient is φ = 1344312372240.

The previous prime is 2221121210101. The next prime is 2221121210129. The reversal of 2221121210121 is 1210121211222.

2221121210121 is a `hidden beast` number, since 222 + 112 + 1 + 210 + 121 = 666.

It is not a de Polignac number, because 2221121210121 - 2⁶ = 2221121210057 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2221121210094 and 2221121210103.

It is not an unprimeable number, because it can be changed into a prime (2221121210129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4840411 + ... + 5279376.

It is an arithmetic number, because the mean of its divisors is an integer number (112329646800).

Almost surely, 2^{2221121210121} is an apocalyptic number.

It is an amenable number.

2221121210121 is a deficient number, since it is larger than the sum of its proper divisors (1373427487479).

2221121210121 is a wasteful number, since it uses less digits than its factorization.

2221121210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10120546 (or 10120540 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2221121210121 its reverse (1210121211222), we get a palindrome (3431242421343).

The spelling of 2221121210121 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".