2221120121 has 16 divisors (see below), whose sum is σ = 2638526400. Its totient is φ = 1846958400.

The previous prime is 2221120093. The next prime is 2221120127. The reversal of 2221120121 is 1210211222.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221120121 is a prime.

It is a super-2 number, since 2×2221120121² = 9866749183822109282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221120096 and 2221120105.

It is not an unprimeable number, because it can be changed into a prime (2221120127) 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, 177170 + ... + 189291.

It is an arithmetic number, because the mean of its divisors is an integer number (164907900).

Almost surely, 2^2221120121 is an apocalyptic number.

It is an amenable number.

2221120121 is a deficient number, since it is larger than the sum of its proper divisors (417406279).

2221120121 is a wasteful number, since it uses less digits than its factorization.

2221120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366520.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2221120121 is about 47128.7610806819. The cubic root of 2221120121 is about 1304.7401156959.

Adding to 2221120121 its reverse (1210211222), we get a palindrome (3431331343).

It can be divided in two parts, 22211201 and 21, that added together give a palindrome (22211222).

The spelling of 2221120121 in words is "two billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".