1231121330 has 16 divisors (see below), whose sum is σ = 2221167744. Its totient is φ = 491304240.

The previous prime is 1231121329. The next prime is 1231121341. The reversal of 1231121330 is 331211321.

It is a junction number, because it is equal to n+sod(n) for n = 1231121299 and 1231121308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138512 + ... + 147131.

It is an arithmetic number, because the mean of its divisors is an integer number (138822984).

Almost surely, 2^1231121330 is an apocalyptic number.

1231121330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231121330 is a deficient number, since it is larger than the sum of its proper divisors (990046414).

1231121330 is a wasteful number, since it uses less digits than its factorization.

1231121330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286081.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1231121330 is about 35087.3385995575. The cubic root of 1231121330 is about 1071.7667640881.

Adding to 1231121330 its reverse (331211321), we get a palindrome (1562332651).

The spelling of 1231121330 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, three hundred thirty".