2123123121000 has 384 divisors, whose sum is σ = 8282547336960. Its totient is φ = 480479040000.

The previous prime is 2123123120981. The next prime is 2123123121011. The reversal of 2123123121000 is 1213213212.

2123123121000 is a `hidden beast` number, since 21 + 231 + 2 + 312 + 100 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6196167 + ... + 6529833.

It is an arithmetic number, because the mean of its divisors is an integer number (21569133690).

Almost surely, 2^{2123123121000} is an apocalyptic number.

2123123121000 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 2123123121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4141273668480).

2123123121000 is an abundant number, since it is smaller than the sum of its proper divisors (6159424215960).

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

2123123121000 is a wasteful number, since it uses less digits than its factorization.

2123123121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333802 (or 333785 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 2123123121000 its reverse (1213213212), we get a palindrome (2124336334212).

The spelling of 2123123121000 in words is "two trillion, one hundred twenty-three billion, one hundred twenty-three million, one hundred twenty-one thousand".