1001200002100 has 18 divisors (see below), whose sum is σ = 2172604004774. Its totient is φ = 400480000800.

The previous prime is 1001200001999. The next prime is 1001200002133. The reversal of 1001200002100 is 12000021001.

It can be written as a sum of positive squares in 3 ways, for example, as 311804964 + 1000888197136 = 17658^2 + 1000444^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5005999911 + ... + 5006000110.

Almost surely, 2^{1001200002100} is an apocalyptic number.

1001200002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001200002100 is an abundant number, since it is smaller than the sum of its proper divisors (1171404002674).

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

1001200002100 is a wasteful number, since it uses less digits than its factorization.

1001200002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10012000035 (or 10012000028 counting only the distinct ones).

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

Adding to 1001200002100 its reverse (12000021001), we get a palindrome (1013200023101).

The spelling of 1001200002100 in words is "one trillion, one billion, two hundred million, two thousand, one hundred".