42766121 has 4 divisors (see below), whose sum is σ = 42836052. Its totient is φ = 42696192.

The previous prime is 42766103. The next prime is 42766181. The reversal of 42766121 is 12166724.

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 23088025 + 19678096 = 4805^2 + 4436^2 .

It is a cyclic number.

It is not a de Polignac number, because 42766121 - 2¹⁰ = 42765097 is a prime.

It is a super-2 number, since 2×42766121² = 3657882210773282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42766181) 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, 34040 + ... + 35273.

It is an arithmetic number, because the mean of its divisors is an integer number (10709013).

Almost surely, 2^42766121 is an apocalyptic number.

It is an amenable number.

42766121 is a deficient number, since it is larger than the sum of its proper divisors (69931).

42766121 is an equidigital number, since it uses as much as digits as its factorization.

42766121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69930.

The product of its digits is 4032, while the sum is 29.

The square root of 42766121 is about 6539.5811027924. The cubic root of 42766121 is about 349.7034794705.

The spelling of 42766121 in words is "forty-two million, seven hundred sixty-six thousand, one hundred twenty-one".