7223122121 has 4 divisors (see below), whose sum is σ = 7223299200. Its totient is φ = 7222945044.

The previous prime is 7223122117. The next prime is 7223122139. The reversal of 7223122121 is 1212213227.

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 7223122121 - 2² = 7223122117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7223122111) 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, 7040 + ... + 120398.

It is an arithmetic number, because the mean of its divisors is an integer number (1805824800).

Almost surely, 2^7223122121 is an apocalyptic number.

It is an amenable number.

7223122121 is a deficient number, since it is larger than the sum of its proper divisors (177079).

7223122121 is a wasteful number, since it uses less digits than its factorization.

7223122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177078.

The product of its digits is 672, while the sum is 23.

The square root of 7223122121 is about 84988.9529350727. The cubic root of 7223122121 is about 1933.0436125081.

Adding to 7223122121 its reverse (1212213227), we get a palindrome (8435335348).

The spelling of 7223122121 in words is "seven billion, two hundred twenty-three million, one hundred twenty-two thousand, one hundred twenty-one".