1203323121 has 224 divisors, whose sum is σ = 2591301888. Its totient is φ = 537477120.

The previous prime is 1203323119. The next prime is 1203323171. The reversal of 1203323121 is 1213233021.

1203323121 is a `hidden beast` number, since 1 + 20 + 332 + 312 + 1 = 666.

It is not a de Polignac number, because 1203323121 - 2¹ = 1203323119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1203323094 and 1203323103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203323171) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 12405345 + ... + 12405441.

It is an arithmetic number, because the mean of its divisors is an integer number (11568312).

Almost surely, 2^1203323121 is an apocalyptic number.

1203323121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1203323121 is an abundant number, since it is smaller than the sum of its proper divisors (1387978767).

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

1203323121 is a wasteful number, since it uses less digits than its factorization.

1203323121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1203323121 is about 34688.9481103132. The cubic root of 1203323121 is about 1063.6385937016.

Adding to 1203323121 its reverse (1213233021), we get a palindrome (2416556142).

The spelling of 1203323121 in words is "one billion, two hundred three million, three hundred twenty-three thousand, one hundred twenty-one".