21312423034040 has 64 divisors (see below), whose sum is σ = 48646207411200. Its totient is φ = 8402107139712.

The previous prime is 21312423034033. The next prime is 21312423034057. The reversal of 21312423034040 is 4043032421312.

It is a junction number, because it is equal to n+sod(n) for n = 21312423033994 and 21312423034012.

It is a congruent number.

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, 4210652 + ... + 7768811.

It is an arithmetic number, because the mean of its divisors is an integer number (760096990800).

Almost surely, 2^{21312423034040} is an apocalyptic number.

21312423034040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312423034040 is an abundant number, since it is smaller than the sum of its proper divisors (27333784377160).

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

21312423034040 is a wasteful number, since it uses less digits than its factorization.

21312423034040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11980116 (or 11980112 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21312423034040 its reverse (4043032421312), we get a palindrome (25355455455352).

The spelling of 21312423034040 in words is "twenty-one trillion, three hundred twelve billion, four hundred twenty-three million, thirty-four thousand, forty".