2001101211990 has 96 divisors (see below), whose sum is σ = 5211444420000. Its totient is φ = 532747445760.

The previous prime is 2001101211929. The next prime is 2001101211997. The reversal of 2001101211990 is 991121011002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001101211997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 251738536 + ... + 251746484.

It is an arithmetic number, because the mean of its divisors is an integer number (54285879375).

Almost surely, 2^{2001101211990} is an apocalyptic number.

2001101211990 is an abundant number, since it is smaller than the sum of its proper divisors (3210343208010).

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

2001101211990 is a wasteful number, since it uses less digits than its factorization.

2001101211990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12222 (or 12219 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

Adding to 2001101211990 its reverse (991121011002), we get a palindrome (2992222222992).

The spelling of 2001101211990 in words is "two trillion, one billion, one hundred one million, two hundred eleven thousand, nine hundred ninety".