21300035212240 has 20 divisors (see below), whose sum is σ = 49522581868644. Its totient is φ = 8520014084864.

The previous prime is 21300035212223. The next prime is 21300035212241. The reversal of 21300035212240 is 4221253000312.

It can be written as a sum of positive squares in 2 ways, for example, as 3846289750416 + 17453745461824 = 1961196^2 + 4177768^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300035212241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133125219997 + ... + 133125220156.

Almost surely, 2^{21300035212240} is an apocalyptic number.

21300035212240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300035212240 is an abundant number, since it is smaller than the sum of its proper divisors (28222546656404).

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

21300035212240 is a wasteful number, since it uses less digits than its factorization.

21300035212240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266250440166 (or 266250440160 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21300035212240 its reverse (4221253000312), we get a palindrome (25521288212552).

The spelling of 21300035212240 in words is "twenty-one trillion, three hundred billion, thirty-five million, two hundred twelve thousand, two hundred forty".