42103121 has 4 divisors (see below), whose sum is σ = 42216372. Its totient is φ = 41989872.

The previous prime is 42103093. The next prime is 42103123. The reversal of 42103121 is 12130124.

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 10010896 + 32092225 = 3164^2 + 5665^2 .

It is a cyclic number.

It is not a de Polignac number, because 42103121 - 2⁶ = 42103057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42103096 and 42103105.

It is not an unprimeable number, because it can be changed into a prime (42103123) 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, 56066 + ... + 56811.

It is an arithmetic number, because the mean of its divisors is an integer number (10554093).

Almost surely, 2^42103121 is an apocalyptic number.

It is an amenable number.

42103121 is a deficient number, since it is larger than the sum of its proper divisors (113251).

42103121 is a wasteful number, since it uses less digits than its factorization.

42103121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113250.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 42103121 is about 6488.6917787794. The cubic root of 42103121 is about 347.8869171705.

Adding to 42103121 its reverse (12130124), we get a palindrome (54233245).

It can be divided in two parts, 42103 and 121, that added together give a palindrome (42224).

The spelling of 42103121 in words is "forty-two million, one hundred three thousand, one hundred twenty-one".