21312343041440 has 96 divisors (see below), whose sum is σ = 55471559754240. Its totient is φ = 7673210752000.

The previous prime is 21312343041439. The next prime is 21312343041463. The reversal of 21312343041440 is 4414034321312.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 21312343041397 and 21312343041406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59769200 + ... + 60124719.

It is an arithmetic number, because the mean of its divisors is an integer number (577828747440).

Almost surely, 2^{21312343041440} is an apocalyptic number.

21312343041440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312343041440 is an abundant number, since it is smaller than the sum of its proper divisors (34159216712800).

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

21312343041440 is a wasteful number, since it uses less digits than its factorization.

21312343041440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119894046 (or 119894038 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21312343041440 its reverse (4414034321312), we get a palindrome (25726377362752).

The spelling of 21312343041440 in words is "twenty-one trillion, three hundred twelve billion, three hundred forty-three million, forty-one thousand, four hundred forty".