1231121300 has 72 divisors (see below), whose sum is σ = 2838193344. Its totient is φ = 461923840.

The previous prime is 1231121273. The next prime is 1231121329. The reversal of 1231121300 is 31211321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 588857 + ... + 590943.

It is an arithmetic number, because the mean of its divisors is an integer number (39419352).

Almost surely, 2^1231121300 is an apocalyptic number.

1231121300 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 1231121300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1419096672).

1231121300 is an abundant number, since it is smaller than the sum of its proper divisors (1607072044).

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

1231121300 is a wasteful number, since it uses less digits than its factorization.

1231121300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465 (or 2458 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1231121300 is about 35087.3381720529. The cubic root of 1231121300 is about 1071.7667553825.

Adding to 1231121300 its reverse (31211321), we get a palindrome (1262332621).

The spelling of 1231121300 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, three hundred".