42121422 has 24 divisors (see below), whose sum is σ = 104300976. Its totient is φ = 12034656.

The previous prime is 42121399. The next prime is 42121459. The reversal of 42121422 is 22412124.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 42121395 and 42121404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167023 + ... + 167274.

It is an arithmetic number, because the mean of its divisors is an integer number (4345874).

Almost surely, 2^42121422 is an apocalyptic number.

42121422 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

42121422 is an abundant number, since it is smaller than the sum of its proper divisors (62179554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42121422 is a wasteful number, since it uses less digits than its factorization.

42121422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334312 (or 334309 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 42121422 is about 6490.1018481993. The cubic root of 42121422 is about 347.9373153047.

Adding to 42121422 its reverse (22412124), we get a palindrome (64533546).

The spelling of 42121422 in words is "forty-two million, one hundred twenty-one thousand, four hundred twenty-two".