21010201100249 has 2 divisors, whose sum is σ = 21010201100250. Its totient is φ = 21010201100248.

The previous prime is 21010201100209. The next prime is 21010201100269. The reversal of 21010201100249 is 94200110201012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10808839782400 + 10201361317849 = 3287680^2 + 3193957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010201100249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010201100209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505100550124 + 10505100550125.

It is an arithmetic number, because the mean of its divisors is an integer number (10505100550125).

Almost surely, 2^{21010201100249} is an apocalyptic number.

It is an amenable number.

21010201100249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010201100249 is an equidigital number, since it uses as much as digits as its factorization.

21010201100249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21010201100249 in words is "twenty-one trillion, ten billion, two hundred one million, one hundred thousand, two hundred forty-nine".