1000012100 has 18 divisors (see below), whose sum is σ = 2170026474. Its totient is φ = 400004800.

The previous prime is 1000012037. The next prime is 1000012121. The reversal of 1000012100 is 12100001.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 53465344 + 946546756 = 7312^2 + 30766^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4999961 + ... + 5000160.

Almost surely, 2^1000012100 is an apocalyptic number.

1000012100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000012100 is an abundant number, since it is smaller than the sum of its proper divisors (1170014374).

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

1000012100 is a wasteful number, since it uses less digits than its factorization.

1000012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000135 (or 10000128 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 1000012100 is about 31622.9679189035. The cubic root of 1000012100 is about 1000.0040333171.

Adding to 1000012100 its reverse (12100001), we get a palindrome (1012112101).

It can be divided in two parts, 10000 and 12100, that multiplied together give a square (121000000 = 11000²).

The spelling of 1000012100 in words is "one billion, twelve thousand, one hundred".