1231220342 has 24 divisors (see below), whose sum is σ = 2140219800. Its totient is φ = 526722560.

The previous prime is 1231220303. The next prime is 1231220351. The reversal of 1231220342 is 2430221321.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90467 + ... + 103182.

It is an arithmetic number, because the mean of its divisors is an integer number (89175825).

Almost surely, 2^1231220342 is an apocalyptic number.

1231220342 is a deficient number, since it is larger than the sum of its proper divisors (908999458).

1231220342 is a wasteful number, since it uses less digits than its factorization.

1231220342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193696 (or 193679 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1231220342 is about 35088.7495074988. The cubic root of 1231220342 is about 1071.7954953278.

Adding to 1231220342 its reverse (2430221321), we get a palindrome (3661441663).

The spelling of 1231220342 in words is "one billion, two hundred thirty-one million, two hundred twenty thousand, three hundred forty-two".