21013402032340 has 24 divisors (see below), whose sum is σ = 44139206893320. Its totient is φ = 8403253646208.

The previous prime is 21013402032253. The next prime is 21013402032409. The reversal of 21013402032340 is 4323020431012.

It can be written as a sum of positive squares in 4 ways, for example, as 5417963833104 + 15595438199236 = 2327652^2 + 3949106^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 131616147 + ... + 131775706.

It is an arithmetic number, because the mean of its divisors is an integer number (1839133620555).

Almost surely, 2^{21013402032340} is an apocalyptic number.

21013402032340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013402032340 is an abundant number, since it is smaller than the sum of its proper divisors (23125804860980).

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

21013402032340 is a wasteful number, since it uses less digits than its factorization.

21013402032340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263395851 (or 263395849 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21013402032340 its reverse (4323020431012), we get a palindrome (25336422463352).

The spelling of 21013402032340 in words is "twenty-one trillion, thirteen billion, four hundred two million, thirty-two thousand, three hundred forty".