1200321120 has 48 divisors (see below), whose sum is σ = 3781013040. Its totient is φ = 320085504.

The previous prime is 1200321119. The next prime is 1200321127. The reversal of 1200321120 is 211230021.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1200321120² = 2881541582236108800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1200321096 and 1200321105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200321127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1249855 + ... + 1250814.

It is an arithmetic number, because the mean of its divisors is an integer number (78771105).

Almost surely, 2^1200321120 is an apocalyptic number.

1200321120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200321120 is an abundant number, since it is smaller than the sum of its proper divisors (2580691920).

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

1200321120 is a wasteful number, since it uses less digits than its factorization.

1200321120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500687 (or 2500679 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1200321120 is about 34645.6508093007. The cubic root of 1200321120 is about 1062.7533498730.

Adding to 1200321120 its reverse (211230021), we get a palindrome (1411551141).

The spelling of 1200321120 in words is "one billion, two hundred million, three hundred twenty-one thousand, one hundred twenty".