8142121 has 4 divisors (see below), whose sum is σ = 8768452. Its totient is φ = 7515792.

The previous prime is 8142107. The next prime is 8142131. The reversal of 8142121 is 1212418.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 640000 + 7502121 = 800^2 + 2739^2 .

It is a cyclic number.

It is not a de Polignac number, because 8142121 - 2⁷ = 8141993 is a prime.

It is a Duffinian number.

8142121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8142131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313146 + ... + 313171.

It is an arithmetic number, because the mean of its divisors is an integer number (2192113).

Almost surely, 2^8142121 is an apocalyptic number.

It is an amenable number.

8142121 is a deficient number, since it is larger than the sum of its proper divisors (626331).

8142121 is a wasteful number, since it uses less digits than its factorization.

8142121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626330.

The product of its digits is 128, while the sum is 19.

The square root of 8142121 is about 2853.4402043849. The cubic root of 8142121 is about 201.1773967496.

Adding to 8142121 its reverse (1212418), we get a palindrome (9354539).

It can be divided in two parts, 8 and 142121, that added together give a square (142129 = 377²).

The spelling of 8142121 in words is "eight million, one hundred forty-two thousand, one hundred twenty-one".