2102021100 has 108 divisors (see below), whose sum is σ = 6976287864. Its totient is φ = 527562240.

The previous prime is 2102021081. The next prime is 2102021107. The reversal of 2102021100 is 11202012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (2102021107) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 53394 + ... + 83993.

It is an arithmetic number, because the mean of its divisors is an integer number (64595258).

Almost surely, 2^2102021100 is an apocalyptic number.

2102021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102021100 is an abundant number, since it is smaller than the sum of its proper divisors (4874266764).

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

2102021100 is a wasteful number, since it uses less digits than its factorization.

2102021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137424 (or 137414 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2102021100 is about 45847.8036551371. The cubic root of 2102021100 is about 1280.9898552544.

Adding to 2102021100 its reverse (11202012), we get a palindrome (2113223112).

The spelling of 2102021100 in words is "two billion, one hundred two million, twenty-one thousand, one hundred".