11211220201 has 2 divisors, whose sum is σ = 11211220202. Its totient is φ = 11211220200.

The previous prime is 11211220147. The next prime is 11211220217. The reversal of 11211220201 is 10202211211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10858682025 + 352538176 = 104205^2 + 18776^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211220201 - 2¹¹ = 11211218153 is a prime.

It is not a weakly prime, because it can be changed into another prime (11211221201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605610100 + 5605610101.

It is an arithmetic number, because the mean of its divisors is an integer number (5605610101).

Almost surely, 2^11211220201 is an apocalyptic number.

It is an amenable number.

11211220201 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211220201 is an equidigital number, since it uses as much as digits as its factorization.

11211220201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11211220201 its reverse (10202211211), we get a palindrome (21413431412).

The spelling of 11211220201 in words is "eleven billion, two hundred eleven million, two hundred twenty thousand, two hundred one".