7522121 has 4 divisors (see below), whose sum is σ = 7533972. Its totient is φ = 7510272.

The previous prime is 7522111. The next prime is 7522159. The reversal of 7522121 is 1212257.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1212257 = 19 ⋅63803.

It can be written as a sum of positive squares in 2 ways, for example, as 4682896 + 2839225 = 2164^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 7522121 - 2¹⁴ = 7505737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7522093 and 7522102.

It is not an unprimeable number, because it can be changed into a prime (7522111) 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, 4916 + ... + 6261.

It is an arithmetic number, because the mean of its divisors is an integer number (1883493).

Almost surely, 2^7522121 is an apocalyptic number.

It is an amenable number.

7522121 is a deficient number, since it is larger than the sum of its proper divisors (11851).

7522121 is a wasteful number, since it uses less digits than its factorization.

7522121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11850.

The product of its digits is 280, while the sum is 20.

The square root of 7522121 is about 2742.6485374543. The cubic root of 7522121 is about 195.9356393569.

Adding to 7522121 its reverse (1212257), we get a palindrome (8734378).

The spelling of 7522121 in words is "seven million, five hundred twenty-two thousand, one hundred twenty-one".