2105421020 has 12 divisors (see below), whose sum is σ = 4421384184. Its totient is φ = 842168400.

The previous prime is 2105420969. The next prime is 2105421023. The reversal of 2105421020 is 201245012.

It is a self number, because there is not a number n which added to its sum of digits gives 2105421020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105421023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52635506 + ... + 52635545.

It is an arithmetic number, because the mean of its divisors is an integer number (368448682).

Almost surely, 2^2105421020 is an apocalyptic number.

2105421020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2105421020 is an abundant number, since it is smaller than the sum of its proper divisors (2315963164).

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

2105421020 is a wasteful number, since it uses less digits than its factorization.

2105421020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105271060 (or 105271058 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 2105421020 is about 45884.8670042749. The cubic root of 2105421020 is about 1281.6801301193.

Adding to 2105421020 its reverse (201245012), we get a palindrome (2306666032).

The spelling of 2105421020 in words is "two billion, one hundred five million, four hundred twenty-one thousand, twenty".