2001021211000 has 128 divisors (see below), whose sum is σ = 5475752156160. Its totient is φ = 670109328000.

The previous prime is 2001021210989. The next prime is 2001021211009. The reversal of 2001021211000 is 1121201002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001021211009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3022956 + ... + 3624955.

It is an arithmetic number, because the mean of its divisors is an integer number (42779313720).

Almost surely, 2^{2001021211000} is an apocalyptic number.

2001021211000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001021211000 is an abundant number, since it is smaller than the sum of its proper divisors (3474730945160).

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

2001021211000 is a wasteful number, since it uses less digits than its factorization.

2001021211000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6647982 (or 6647968 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2001021211000 its reverse (1121201002), we get a palindrome (2002142412002).

The spelling of 2001021211000 in words is "two trillion, one billion, twenty-one million, two hundred eleven thousand".