1012002100 has 18 divisors (see below), whose sum is σ = 2196044774. Its totient is φ = 404800800.

The previous prime is 1012002077. The next prime is 1012002109. The reversal of 1012002100 is 12002101.

It can be written as a sum of positive squares in 3 ways, for example, as 58798224 + 953203876 = 7668^2 + 30874^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012002109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5059911 + ... + 5060110.

Almost surely, 2^1012002100 is an apocalyptic number.

1012002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012002100 is an abundant number, since it is smaller than the sum of its proper divisors (1184042674).

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

1012002100 is a wasteful number, since it uses less digits than its factorization.

1012002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120035 (or 10120028 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1012002100 is about 31811.9804476238. The cubic root of 1012002100 is about 1003.9848002757.

Adding to 1012002100 its reverse (12002101), we get a palindrome (1024004201).

Subtracting from 1012002100 its reverse (12002101), we obtain a palindrome (999999999).

The spelling of 1012002100 in words is "one billion, twelve million, two thousand, one hundred".