21100203013313 has 2 divisors, whose sum is σ = 21100203013314. Its totient is φ = 21100203013312.

The previous prime is 21100203013301. The next prime is 21100203013343. The reversal of 21100203013313 is 31331030200112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19280380429249 + 1819822584064 = 4390943^2 + 1349008^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100203013313 - 2⁴ = 21100203013297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100203013343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550101506656 + 10550101506657.

It is an arithmetic number, because the mean of its divisors is an integer number (10550101506657).

Almost surely, 2^{21100203013313} is an apocalyptic number.

It is an amenable number.

21100203013313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100203013313 is an equidigital number, since it uses as much as digits as its factorization.

21100203013313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21100203013313 its reverse (31331030200112), we get a palindrome (52431233213425).

The spelling of 21100203013313 in words is "twenty-one trillion, one hundred billion, two hundred three million, thirteen thousand, three hundred thirteen".