2000123121990 has 128 divisors (see below), whose sum is σ = 5525161574400. Its totient is φ = 453914928000.

The previous prime is 2000123121977. The next prime is 2000123121991. The reversal of 2000123121990 is 991213210002.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2000123121991) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 67559211 + ... + 67588809.

It is an arithmetic number, because the mean of its divisors is an integer number (43165324800).

Almost surely, 2^{2000123121990} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2000123121990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2762580787200).

2000123121990 is an abundant number, since it is smaller than the sum of its proper divisors (3525038452410).

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

2000123121990 is a wasteful number, since it uses less digits than its factorization.

2000123121990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31898.

The product of its (nonzero) digits is 1944, while the sum is 30.

Adding to 2000123121990 its reverse (991213210002), we get a palindrome (2991336331992).

The spelling of 2000123121990 in words is "two trillion, one hundred twenty-three million, one hundred twenty-one thousand, nine hundred ninety".