1232121240 has 256 divisors, whose sum is σ = 4970419200. Its totient is φ = 265033728.

The previous prime is 1232121239. The next prime is 1232121259. The reversal of 1232121240 is 421212321.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 123727 + ... + 133313.

It is an arithmetic number, because the mean of its divisors is an integer number (19415700).

Almost surely, 2^1232121240 is an apocalyptic number.

1232121240 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 1232121240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2485209600).

1232121240 is an abundant number, since it is smaller than the sum of its proper divisors (3738297960).

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

1232121240 is a wasteful number, since it uses less digits than its factorization.

1232121240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9631 (or 9621 counting only the distinct ones).

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

The square root of 1232121240 is about 35101.5845796169. The cubic root of 1232121240 is about 1072.0568465993.

Adding to 1232121240 its reverse (421212321), we get a palindrome (1653333561).

The spelling of 1232121240 in words is "one billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred forty".