1231423404442 has 32 divisors (see below), whose sum is σ = 2303441529984. Its totient is φ = 479667052800.

The previous prime is 1231423404401. The next prime is 1231423404517. The reversal of 1231423404442 is 2444043241321.

It is a junction number, because it is equal to n+sod(n) for n = 1231423404398 and 1231423404407.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216363 + ... + 1584190.

It is an arithmetic number, because the mean of its divisors is an integer number (71982547812).

Almost surely, 2^{1231423404442} is an apocalyptic number.

1231423404442 is a deficient number, since it is larger than the sum of its proper divisors (1072018125542).

1231423404442 is a wasteful number, since it uses less digits than its factorization.

1231423404442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805014.

The product of its (nonzero) digits is 73728, while the sum is 34.

Adding to 1231423404442 its reverse (2444043241321), we get a palindrome (3675466645763).

The spelling of 1231423404442 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-three million, four hundred four thousand, four hundred forty-two".