42227021 has 4 divisors (see below), whose sum is σ = 42241500. Its totient is φ = 42212544.

The previous prime is 42226981. The next prime is 42227023. The reversal of 42227021 is 12072224.

It is a happy number.

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 29702500 + 12524521 = 5450^2 + 3539^2 .

It is a cyclic number.

It is not a de Polignac number, because 42227021 - 2¹⁸ = 41964877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42226984 and 42227002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42227023) 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, 1166 + ... + 9263.

It is an arithmetic number, because the mean of its divisors is an integer number (10560375).

Almost surely, 2^42227021 is an apocalyptic number.

It is an amenable number.

42227021 is a deficient number, since it is larger than the sum of its proper divisors (14479).

42227021 is a wasteful number, since it uses less digits than its factorization.

42227021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14478.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 42227021 is about 6498.2321442066. The cubic root of 42227021 is about 348.2278339166.

Adding to 42227021 its reverse (12072224), we get a palindrome (54299245).

The spelling of 42227021 in words is "forty-two million, two hundred twenty-seven thousand, twenty-one".