42451022 has 4 divisors (see below), whose sum is σ = 63676536. Its totient is φ = 21225510.

The previous prime is 42451021. The next prime is 42451051. The reversal of 42451022 is 22015424.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 42450985 and 42451003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42451021) 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 as a sum of consecutive naturals, namely, 10612754 + ... + 10612757.

It is an arithmetic number, because the mean of its divisors is an integer number (15919134).

Almost surely, 2^42451022 is an apocalyptic number.

42451022 is a deficient number, since it is larger than the sum of its proper divisors (21225514).

42451022 is a wasteful number, since it uses less digits than its factorization.

42451022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21225513.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 42451022 is about 6515.4448812034. Note that the first 3 decimals coincide. The cubic root of 42451022 is about 348.8424945333.

Adding to 42451022 its reverse (22015424), we get a palindrome (64466446).

The spelling of 42451022 in words is "forty-two million, four hundred fifty-one thousand, twenty-two".