1231242120 has 192 divisors, whose sum is σ = 4177293120. Its totient is φ = 326156544.

The previous prime is 1231242113. The next prime is 1231242137. The reversal of 1231242120 is 212421321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1231242093 and 1231242102.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1914519 + ... + 1915161.

It is an arithmetic number, because the mean of its divisors is an integer number (21756735).

Almost surely, 2^1231242120 is an apocalyptic number.

1231242120 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 1231242120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088646560).

1231242120 is an abundant number, since it is smaller than the sum of its proper divisors (2946051000).

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

1231242120 is a wasteful number, since it uses less digits than its factorization.

1231242120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1231242120 is about 35089.0598335151. The cubic root of 1231242120 is about 1071.8018146475.

Adding to 1231242120 its reverse (212421321), we get a palindrome (1443663441).

The spelling of 1231242120 in words is "one billion, two hundred thirty-one million, two hundred forty-two thousand, one hundred twenty".