42130921 has 4 divisors (see below), whose sum is σ = 48149632. Its totient is φ = 36112212.

The previous prime is 42130889. The next prime is 42130943. The reversal of 42130921 is 12903124.

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 a cyclic number.

It is not a de Polignac number, because 42130921 - 2⁵ = 42130889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42130892 and 42130901.

It is not an unprimeable number, because it can be changed into a prime (42130951) 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, 3009345 + ... + 3009358.

It is an arithmetic number, because the mean of its divisors is an integer number (12037408).

Almost surely, 2^42130921 is an apocalyptic number.

It is an amenable number.

42130921 is a deficient number, since it is larger than the sum of its proper divisors (6018711).

42130921 is an equidigital number, since it uses as much as digits as its factorization.

42130921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6018710.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 42130921 is about 6490.8336136432. The cubic root of 42130921 is about 347.9634683324.

The spelling of 42130921 in words is "forty-two million, one hundred thirty thousand, nine hundred twenty-one".