2221254121 has 4 divisors (see below), whose sum is σ = 2221599744. Its totient is φ = 2220908500.

The previous prime is 2221254107. The next prime is 2221254131. The reversal of 2221254121 is 1214521222.

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 2221254121 - 2²³ = 2212865513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221254092 and 2221254101.

It is not an unprimeable number, because it can be changed into a prime (2221254131) 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, 162985 + ... + 176086.

It is an arithmetic number, because the mean of its divisors is an integer number (555399936).

Almost surely, 2^2221254121 is an apocalyptic number.

It is an amenable number.

2221254121 is a deficient number, since it is larger than the sum of its proper divisors (345623).

2221254121 is an equidigital number, since it uses as much as digits as its factorization.

2221254121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345622.

The product of its digits is 640, while the sum is 22.

The square root of 2221254121 is about 47130.1826964420. The cubic root of 2221254121 is about 1304.7663534574.

Adding to 2221254121 its reverse (1214521222), we get a palindrome (3435775343).

The spelling of 2221254121 in words is "two billion, two hundred twenty-one million, two hundred fifty-four thousand, one hundred twenty-one".