1205123100000 has 288 divisors, whose sum is σ = 3958824119040. Its totient is φ = 320978880000.

The previous prime is 1205123099969. The next prime is 1205123100007. The reversal of 1205123100000 is 13215021.

It is a super-2 number, since 2×1205123100000² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205123100007) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 318898111 + ... + 318901889.

It is an arithmetic number, because the mean of its divisors is an integer number (13745917080).

Almost surely, 2^{1205123100000} is an apocalyptic number.

1205123100000 is a gapful number since it is divisible by the number (10) 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 1205123100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1979412059520).

1205123100000 is an abundant number, since it is smaller than the sum of its proper divisors (2753701019040).

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

1205123100000 is an equidigital number, since it uses as much as digits as its factorization.

1205123100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4880 (or 4852 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

Adding to 1205123100000 its reverse (13215021), we get a palindrome (1205136315021).

The spelling of 1205123100000 in words is "one trillion, two hundred five billion, one hundred twenty-three million, one hundred thousand".