21011101200997 has 2 divisors, whose sum is σ = 21011101200998. Its totient is φ = 21011101200996.

The previous prime is 21011101200983. The next prime is 21011101201021. The reversal of 21011101200997 is 79900210111012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20924119855521 + 86981345476 = 4574289^2 + 294926^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011101200997 - 2²⁷ = 21010966983269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011101200967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505550600498 + 10505550600499.

It is an arithmetic number, because the mean of its divisors is an integer number (10505550600499).

Almost surely, 2^{21011101200997} is an apocalyptic number.

It is an amenable number.

21011101200997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011101200997 is an equidigital number, since it uses as much as digits as its factorization.

21011101200997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 34.

The spelling of 21011101200997 in words is "twenty-one trillion, eleven billion, one hundred one million, two hundred thousand, nine hundred ninety-seven".