21011210201 has 2 divisors, whose sum is σ = 21011210202. Its totient is φ = 21011210200.

The previous prime is 21011210189. The next prime is 21011210221. The reversal of 21011210201 is 10201211012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12701064601 + 8310145600 = 112699^2 + 91160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011210201 is a prime.

It is a super-2 number, since 2×21011210201² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21011210221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505605100 + 10505605101.

It is an arithmetic number, because the mean of its divisors is an integer number (10505605101).

Almost surely, 2^21011210201 is an apocalyptic number.

It is an amenable number.

21011210201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011210201 is an equidigital number, since it uses as much as digits as its factorization.

21011210201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011210201 its reverse (10201211012), we get a palindrome (31212421213).

The spelling of 21011210201 in words is "twenty-one billion, eleven million, two hundred ten thousand, two hundred one".