21221101201 has 2 divisors, whose sum is σ = 21221101202. Its totient is φ = 21221101200.

The previous prime is 21221101199. The next prime is 21221101211. The reversal of 21221101201 is 10210112212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21218292225 + 2808976 = 145665^2 + 1676^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221101201 - 2¹ = 21221101199 is a prime.

Together with 21221101199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21221101211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610550600 + 10610550601.

It is an arithmetic number, because the mean of its divisors is an integer number (10610550601).

Almost surely, 2^21221101201 is an apocalyptic number.

It is an amenable number.

21221101201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221101201 is an equidigital number, since it uses as much as digits as its factorization.

21221101201 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21221101201 its reverse (10210112212), we get a palindrome (31431213413).

The spelling of 21221101201 in words is "twenty-one billion, two hundred twenty-one million, one hundred one thousand, two hundred one".