21101200099997 has 2 divisors, whose sum is σ = 21101200099998. Its totient is φ = 21101200099996.

The previous prime is 21101200099957. The next prime is 21101200099999. The reversal of 21101200099997 is 79999000210112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15879157037956 + 5222043062041 = 3984866^2 + 2285179^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101200099997 - 2⁸ = 21101200099741 is a prime.

It is a super-2 number, since 2×21101200099997² (a number of 27 digits) contains 22 as substring.

Together with 21101200099999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101200099999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550600049998 + 10550600049999.

It is an arithmetic number, because the mean of its divisors is an integer number (10550600049999).

Almost surely, 2^{21101200099997} is an apocalyptic number.

It is an amenable number.

21101200099997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101200099997 is an equidigital number, since it uses as much as digits as its factorization.

21101200099997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 50.

The spelling of 21101200099997 in words is "twenty-one trillion, one hundred one billion, two hundred million, ninety-nine thousand, nine hundred ninety-seven".