1232400121 has 4 divisors (see below), whose sum is σ = 1232714752. Its totient is φ = 1232085492.

The previous prime is 1232400101. The next prime is 1232400157. The reversal of 1232400121 is 1210042321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1232400121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1232400095 and 1232400104.

It is not an unprimeable number, because it can be changed into a prime (1232400101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151365 + ... + 159298.

It is an arithmetic number, because the mean of its divisors is an integer number (308178688).

Almost surely, 2^1232400121 is an apocalyptic number.

It is an amenable number.

1232400121 is a deficient number, since it is larger than the sum of its proper divisors (314631).

1232400121 is an equidigital number, since it uses as much as digits as its factorization.

1232400121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314630.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1232400121 is about 35105.5568393381. The cubic root of 1232400121 is about 1072.1377243900.

Adding to 1232400121 its reverse (1210042321), we get a palindrome (2442442442).

The spelling of 1232400121 in words is "one billion, two hundred thirty-two million, four hundred thousand, one hundred twenty-one".