42172022 has 4 divisors (see below), whose sum is σ = 63258036. Its totient is φ = 21086010.

The previous prime is 42172007. The next prime is 42172033. The reversal of 42172022 is 22027124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×42172022³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42171985 and 42172003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10543004 + ... + 10543007.

It is an arithmetic number, because the mean of its divisors is an integer number (15814509).

Almost surely, 2^42172022 is an apocalyptic number.

42172022 is a deficient number, since it is larger than the sum of its proper divisors (21086014).

42172022 is a wasteful number, since it uses less digits than its factorization.

42172022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21086013.

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

The square root of 42172022 is about 6493.9989220818. The cubic root of 42172022 is about 348.0765839730.

Adding to 42172022 its reverse (22027124), we get a palindrome (64199146).

The spelling of 42172022 in words is "forty-two million, one hundred seventy-two thousand, twenty-two".