2001000021200 has 60 divisors (see below), whose sum is σ = 5090190953580. Its totient is φ = 753317652480.

The previous prime is 2001000021197. The next prime is 2001000021221. The reversal of 2001000021200 is 21200001002.

It can be written as a sum of positive squares in 6 ways, for example, as 174112583824 + 1826887437376 = 417268^2 + 1351624^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147125555 + ... + 147139154.

It is an arithmetic number, because the mean of its divisors is an integer number (84836515893).

Almost surely, 2^{2001000021200} is an apocalyptic number.

2001000021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001000021200 is an abundant number, since it is smaller than the sum of its proper divisors (3089190932380).

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

2001000021200 is a wasteful number, since it uses less digits than its factorization.

2001000021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294264744 (or 294264733 counting only the distinct ones).

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

Adding to 2001000021200 its reverse (21200001002), we get a palindrome (2022200022202).

The spelling of 2001000021200 in words is "two trillion, one billion, twenty-one thousand, two hundred".