11201210101721 has 2 divisors, whose sum is σ = 11201210101722. Its totient is φ = 11201210101720.

The previous prime is 11201210101717. The next prime is 11201210101729. The reversal of 11201210101721 is 12710101210211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10577038999696 + 624171102025 = 3252236^2 + 790045^2 .

It is a cyclic number.

It is not a de Polignac number, because 11201210101721 - 2² = 11201210101717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11201210101693 and 11201210101702.

It is not a weakly prime, because it can be changed into another prime (11201210101729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5600605050860 + 5600605050861.

It is an arithmetic number, because the mean of its divisors is an integer number (5600605050861).

Almost surely, 2^{11201210101721} is an apocalyptic number.

It is an amenable number.

11201210101721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11201210101721 is an equidigital number, since it uses as much as digits as its factorization.

11201210101721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 20.

Adding to 11201210101721 its reverse (12710101210211), we get a palindrome (23911311311932).

The spelling of 11201210101721 in words is "eleven trillion, two hundred one billion, two hundred ten million, one hundred one thousand, seven hundred twenty-one".