42121321424 has 80 divisors (see below), whose sum is σ = 103683363840. Its totient is φ = 16125834240.

The previous prime is 42121321409. The next prime is 42121321433. The reversal of 42121321424 is 42412312124.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 42121321393 and 42121321402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421469 + ... + 511740.

It is an arithmetic number, because the mean of its divisors is an integer number (1296042048).

Almost surely, 2^42121321424 is an apocalyptic number.

It is an amenable number.

42121321424 is an abundant number, since it is smaller than the sum of its proper divisors (61562042416).

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

42121321424 is a wasteful number, since it uses less digits than its factorization.

42121321424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933268 (or 933262 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

Adding to 42121321424 its reverse (42412312124), we get a palindrome (84533633548).

The spelling of 42121321424 in words is "forty-two billion, one hundred twenty-one million, three hundred twenty-one thousand, four hundred twenty-four".