9942121 has 4 divisors (see below), whose sum is σ = 11362432. Its totient is φ = 8521812.

The previous prime is 9942077. The next prime is 9942133. The reversal of 9942121 is 1212499.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1212499 = 67 ⋅18097.

It is a cyclic number.

It is not a de Polignac number, because 9942121 - 2⁹ = 9941609 is a prime.

It is a Duffinian number.

9942121 is a modest number, since divided by 2121 gives 994 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 9942121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9942151) 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, 710145 + ... + 710158.

It is an arithmetic number, because the mean of its divisors is an integer number (2840608).

Almost surely, 2^9942121 is an apocalyptic number.

It is an amenable number.

9942121 is a deficient number, since it is larger than the sum of its proper divisors (1420311).

9942121 is a wasteful number, since it uses less digits than its factorization.

9942121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420310.

The product of its digits is 1296, while the sum is 28.

The square root of 9942121 is about 3153.1129063197. The cubic root of 9942121 is about 215.0270094065.

The spelling of 9942121 in words is "nine million, nine hundred forty-two thousand, one hundred twenty-one".