42120422 has 4 divisors (see below), whose sum is σ = 63180636. Its totient is φ = 21060210.

The previous prime is 42120409. The next prime is 42120427. The reversal of 42120422 is 22402124.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 42120422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42120427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10530104 + ... + 10530107.

It is an arithmetic number, because the mean of its divisors is an integer number (15795159).

Almost surely, 2^42120422 is an apocalyptic number.

42120422 is a deficient number, since it is larger than the sum of its proper divisors (21060214).

42120422 is a wasteful number, since it uses less digits than its factorization.

42120422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21060213.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 42120422 is about 6490.0248073486. The cubic root of 42120422 is about 347.9345618359.

Adding to 42120422 its reverse (22402124), we get a palindrome (64522546).

The spelling of 42120422 in words is "forty-two million, one hundred twenty thousand, four hundred twenty-two".