21312433321142 has 16 divisors (see below), whose sum is σ = 32357000491200. Its totient is φ = 10526791777032.

The previous prime is 21312433321141. The next prime is 21312433321147. The reversal of 21312433321142 is 24112333421312.

It is a junction number, because it is equal to n+sod(n) for n = 21312433321099 and 21312433321108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312433321141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4629392 + ... + 8003507.

It is an arithmetic number, because the mean of its divisors is an integer number (2022312530700).

Almost surely, 2^{21312433321142} is an apocalyptic number.

21312433321142 is a deficient number, since it is larger than the sum of its proper divisors (11044567170058).

21312433321142 is a wasteful number, since it uses less digits than its factorization.

21312433321142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12643147.

The product of its digits is 20736, while the sum is 32.

Adding to 21312433321142 its reverse (24112333421312), we get a palindrome (45424766742454).

The spelling of 21312433321142 in words is "twenty-one trillion, three hundred twelve billion, four hundred thirty-three million, three hundred twenty-one thousand, one hundred forty-two".