2001021212200 has 24 divisors (see below), whose sum is σ = 4652374318830. Its totient is φ = 800408484800.

The previous prime is 2001021212189. The next prime is 2001021212213. The reversal of 2001021212200 is 22121201002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1316632322916 + 684388889284 = 1147446^2 + 827278^2 .

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, 5002552831 + ... + 5002553230.

Almost surely, 2^{2001021212200} is an apocalyptic number.

2001021212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001021212200 is an abundant number, since it is smaller than the sum of its proper divisors (2651353106630).

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

2001021212200 is a wasteful number, since it uses less digits than its factorization.

2001021212200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10005106077 (or 10005106068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2001021212200 its reverse (22121201002), we get a palindrome (2023142413202).

The spelling of 2001021212200 in words is "two trillion, one billion, twenty-one million, two hundred twelve thousand, two hundred".