21013345413340 has 24 divisors (see below), whose sum is σ = 50432028992352. Its totient is φ = 7204575570240.

The previous prime is 21013345413259. The next prime is 21013345413343. The reversal of 21013345413340 is 4331454331012.

It is a junction number, because it is equal to n+sod(n) for n = 21013345413296 and 21013345413305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013345413343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75047662051 + ... + 75047662330.

It is an arithmetic number, because the mean of its divisors is an integer number (2101334541348).

Almost surely, 2^{21013345413340} is an apocalyptic number.

21013345413340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013345413340 is an abundant number, since it is smaller than the sum of its proper divisors (29418683579012).

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

21013345413340 is a wasteful number, since it uses less digits than its factorization.

21013345413340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150095324397 (or 150095324395 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 21013345413340 its reverse (4331454331012), we get a palindrome (25344799744352).

The spelling of 21013345413340 in words is "twenty-one trillion, thirteen billion, three hundred forty-five million, four hundred thirteen thousand, three hundred forty".