842080121 has 4 divisors (see below), whose sum is σ = 842915700. Its totient is φ = 841244544.

The previous prime is 842080103. The next prime is 842080123. The reversal of 842080121 is 121080248.

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 116532025 + 725548096 = 10795^2 + 26936^2 .

It is a cyclic number.

It is not a de Polignac number, because 842080121 - 2²⁶ = 774971257 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 (842080123) 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, 416276 + ... + 418293.

It is an arithmetic number, because the mean of its divisors is an integer number (210728925).

Almost surely, 2^842080121 is an apocalyptic number.

It is an amenable number.

842080121 is a deficient number, since it is larger than the sum of its proper divisors (835579).

842080121 is a wasteful number, since it uses less digits than its factorization.

842080121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835578.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 842080121 is about 29018.6168002543. The cubic root of 842080121 is about 944.3169932892.

The spelling of 842080121 in words is "eight hundred forty-two million, eighty thousand, one hundred twenty-one".