1231121200 has 30 divisors (see below), whose sum is σ = 2957769644. Its totient is φ = 492448320.

The previous prime is 1231121183. The next prime is 1231121231. The reversal of 1231121200 is 21211321.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1538502 + ... + 1539301.

Almost surely, 2^1231121200 is an apocalyptic number.

1231121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231121200 is an abundant number, since it is smaller than the sum of its proper divisors (1726648444).

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

1231121200 is a wasteful number, since it uses less digits than its factorization.

1231121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077821 (or 3077810 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1231121200 is about 35087.3367470374. The cubic root of 1231121200 is about 1071.7667263638.

Adding to 1231121200 its reverse (21211321), we get a palindrome (1252332521).

It can be divided in two parts, 1231121 and 200, that added together give a palindrome (1231321).

The spelling of 1231121200 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, two hundred".