2231223121 has 4 divisors (see below), whose sum is σ = 2231352432. Its totient is φ = 2231093812.

The previous prime is 2231223091. The next prime is 2231223131. The reversal of 2231223121 is 1213221322.

2231223121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2231223121 - 2¹¹ = 2231221073 is a prime.

It is a super-3 number, since 3×2231223121³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2231223131) 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, 33895 + ... + 74908.

It is an arithmetic number, because the mean of its divisors is an integer number (557838108).

Almost surely, 2^2231223121 is an apocalyptic number.

It is an amenable number.

2231223121 is a deficient number, since it is larger than the sum of its proper divisors (129311).

2231223121 is a wasteful number, since it uses less digits than its factorization.

2231223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129310.

The product of its digits is 288, while the sum is 19.

The square root of 2231223121 is about 47235.8245508639. The cubic root of 2231223121 is about 1306.7153733391.

Adding to 2231223121 its reverse (1213221322), we get a palindrome (3444444443).

The spelling of 2231223121 in words is "two billion, two hundred thirty-one million, two hundred twenty-three thousand, one hundred twenty-one".