42110021 has 4 divisors (see below), whose sum is σ = 42168672. Its totient is φ = 42051372.

The previous prime is 42110017. The next prime is 42110027. The reversal of 42110021 is 12001124.

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 42110021 - 2² = 42110017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42109984 and 42110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42110027) 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, 28235 + ... + 29688.

It is an arithmetic number, because the mean of its divisors is an integer number (10542168).

Almost surely, 2^42110021 is an apocalyptic number.

It is an amenable number.

42110021 is a deficient number, since it is larger than the sum of its proper divisors (58651).

42110021 is an equidigital number, since it uses as much as digits as its factorization.

42110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58650.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 42110021 is about 6489.2234512305. The cubic root of 42110021 is about 347.9059204222.

Adding to 42110021 its reverse (12001124), we get a palindrome (54111145).

The spelling of 42110021 in words is "forty-two million, one hundred ten thousand, twenty-one".