2102421042 has 128 divisors (see below), whose sum is σ = 5136203520. Its totient is φ = 634798080.

The previous prime is 2102421029. The next prime is 2102421047. The reversal of 2102421042 is 2401242012.

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

It is not an unprimeable number, because it can be changed into a prime (2102421047) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3123618 + ... + 3124290.

It is an arithmetic number, because the mean of its divisors is an integer number (40126590).

Almost surely, 2^2102421042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2102421042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2568101760).

2102421042 is an abundant number, since it is smaller than the sum of its proper divisors (3033782478).

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

2102421042 is a wasteful number, since it uses less digits than its factorization.

2102421042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825 (or 819 counting only the distinct ones).

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

The square root of 2102421042 is about 45852.1650742907. The cubic root of 2102421042 is about 1281.0710928081.

Adding to 2102421042 its reverse (2401242012), we get a palindrome (4503663054).

The spelling of 2102421042 in words is "two billion, one hundred two million, four hundred twenty-one thousand, forty-two".