2001211544000 has 224 divisors, whose sum is σ = 5001068666880. Its totient is φ = 793223808000.

The previous prime is 2001211543999. The next prime is 2001211544029. The reversal of 2001211544000 is 4451121002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 1390695281 + ... + 1390696719.

Almost surely, 2^{2001211544000} is an apocalyptic number.

2001211544000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001211544000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2500534333440).

2001211544000 is an abundant number, since it is smaller than the sum of its proper divisors (2999857122880).

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

2001211544000 is a wasteful number, since it uses less digits than its factorization.

2001211544000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924 (or 2904 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 2001211544000 its reverse (4451121002), we get a palindrome (2005662665002).

The spelling of 2001211544000 in words is "two trillion, one billion, two hundred eleven million, five hundred forty-four thousand".