21535012103305 has 4 divisors (see below), whose sum is σ = 25842014523972. Its totient is φ = 17228009682640.

The previous prime is 21535012103287. The next prime is 21535012103321. The reversal of 21535012103305 is 50330121053512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5439702588489 + 16095309514816 = 2332317^2 + 4011896^2 .

It is not a de Polignac number, because 21535012103305 - 2⁴¹ = 19335988847753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2153501210326 + ... + 2153501210335.

It is an arithmetic number, because the mean of its divisors is an integer number (6460503630993).

Almost surely, 2^{21535012103305} is an apocalyptic number.

It is an amenable number.

21535012103305 is a deficient number, since it is larger than the sum of its proper divisors (4307002420667).

21535012103305 is an equidigital number, since it uses as much as digits as its factorization.

21535012103305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4307002420666.

The product of its (nonzero) digits is 13500, while the sum is 31.

Adding to 21535012103305 its reverse (50330121053512), we get a palindrome (71865133156817).

The spelling of 21535012103305 in words is "twenty-one trillion, five hundred thirty-five billion, twelve million, one hundred three thousand, three hundred five".