42121000044 has 144 divisors (see below), whose sum is σ = 112648553472. Its totient is φ = 13244052096.

The previous prime is 42121000027. The next prime is 42121000049. The reversal of 42121000044 is 44000012124.

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 = 42120999990 and 42121000026.

It is not an unprimeable number, because it can be changed into a prime (42121000049) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23622777 + ... + 23624559.

Almost surely, 2^42121000044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42121000044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56324276736).

42121000044 is an abundant number, since it is smaller than the sum of its proper divisors (70527553428).

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

42121000044 is a wasteful number, since it uses less digits than its factorization.

42121000044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196 (or 2191 counting only the distinct ones).

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

Adding to 42121000044 its reverse (44000012124), we get a palindrome (86121012168).

The spelling of 42121000044 in words is "forty-two billion, one hundred twenty-one million, forty-four", and thus it is an aban number.