7722121 has 4 divisors (see below), whose sum is σ = 8424144. Its totient is φ = 7020100.

The previous prime is 7722119. The next prime is 7722139. The reversal of 7722121 is 1212277.

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 7722121 - 2¹ = 7722119 is a prime.

It is a Duffinian number.

7722121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7722092 and 7722101.

It is not an unprimeable number, because it can be changed into a prime (7722191) 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, 350995 + ... + 351016.

It is an arithmetic number, because the mean of its divisors is an integer number (2106036).

Almost surely, 2^7722121 is an apocalyptic number.

It is an amenable number.

7722121 is a deficient number, since it is larger than the sum of its proper divisors (702023).

7722121 is a wasteful number, since it uses less digits than its factorization.

7722121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702022.

The product of its digits is 392, while the sum is 22.

The square root of 7722121 is about 2778.8704539795. The cubic root of 7722121 is about 197.6570006215.

Adding to 7722121 its reverse (1212277), we get a palindrome (8934398).

The spelling of 7722121 in words is "seven million, seven hundred twenty-two thousand, one hundred twenty-one".