1200121323320 has 64 divisors (see below), whose sum is σ = 2866578232320. Its totient is φ = 450630621184.

The previous prime is 1200121323293. The next prime is 1200121323329. The reversal of 1200121323320 is 233231210021.

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

It is a junction number, because it is equal to n+sod(n) for n = 1200121323292 and 1200121323301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121323329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2043587 + ... + 2564466.

It is an arithmetic number, because the mean of its divisors is an integer number (44790284880).

Almost surely, 2^{1200121323320} is an apocalyptic number.

1200121323320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200121323320 is an abundant number, since it is smaller than the sum of its proper divisors (1666456909000).

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

1200121323320 is a wasteful number, since it uses less digits than its factorization.

1200121323320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608464 (or 4608460 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1200121323320 its reverse (233231210021), we get a palindrome (1433352533341).

The spelling of 1200121323320 in words is "one trillion, two hundred billion, one hundred twenty-one million, three hundred twenty-three thousand, three hundred twenty".