42051121 has 4 divisors (see below), whose sum is σ = 48058432. Its totient is φ = 36043812.

The previous prime is 42051091. The next prime is 42051151. The reversal of 42051121 is 12115024.

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.

It is an interprime number because it is at equal distance from previous prime (42051091) and next prime (42051151).

It is not a de Polignac number, because 42051121 - 2¹⁹ = 41526833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42051095 and 42051104.

It is not an unprimeable number, because it can be changed into a prime (42051151) 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, 3003645 + ... + 3003658.

It is an arithmetic number, because the mean of its divisors is an integer number (12014608).

Almost surely, 2^42051121 is an apocalyptic number.

It is an amenable number.

42051121 is a deficient number, since it is larger than the sum of its proper divisors (6007311).

42051121 is an equidigital number, since it uses as much as digits as its factorization.

42051121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6007310.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 42051121 is about 6484.6835697665. The cubic root of 42051121 is about 347.7436374337.

Adding to 42051121 its reverse (12115024), we get a palindrome (54166145).

The spelling of 42051121 in words is "forty-two million, fifty-one thousand, one hundred twenty-one".