31200121200 has 120 divisors (see below), whose sum is σ = 100164845488. Its totient is φ = 8301680640.

The previous prime is 31200121193. The next prime is 31200121201. The reversal of 31200121200 is 212100213.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200121201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 519954 + ... + 576846.

Almost surely, 2^31200121200 is an apocalyptic number.

31200121200 is a gapful number since it is divisible by the number (30) 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 31200121200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50082422744).

31200121200 is an abundant number, since it is smaller than the sum of its proper divisors (68964724288).

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

31200121200 is a wasteful number, since it uses less digits than its factorization.

31200121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57371 (or 57360 counting only the distinct ones).

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

Adding to 31200121200 its reverse (212100213), we get a palindrome (31412221413).

The spelling of 31200121200 in words is "thirty-one billion, two hundred million, one hundred twenty-one thousand, two hundred".