42211021 has 4 divisors (see below), whose sum is σ = 42277312. Its totient is φ = 42144732.

The previous prime is 42211007. The next prime is 42211063. The reversal of 42211021 is 12011224.

It is a happy number.

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 42211021 - 2¹¹ = 42208973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42210992 and 42211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42211321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32181 + ... + 33466.

It is an arithmetic number, because the mean of its divisors is an integer number (10569328).

Almost surely, 2^42211021 is an apocalyptic number.

It is an amenable number.

42211021 is a deficient number, since it is larger than the sum of its proper divisors (66291).

42211021 is an equidigital number, since it uses as much as digits as its factorization.

42211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66290.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 42211021 is about 6497.0009235031. Note that the first 3 decimals coincide. The cubic root of 42211021 is about 348.1838466855.

Adding to 42211021 its reverse (12011224), we get a palindrome (54222245).

The spelling of 42211021 in words is "forty-two million, two hundred eleven thousand, twenty-one".