21012211201 has 2 divisors, whose sum is σ = 21012211202. Its totient is φ = 21012211200.

The previous prime is 21012211183. The next prime is 21012211243. The reversal of 21012211201 is 10211221012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18819724225 + 2192486976 = 137185^2 + 46824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012211201 - 2²⁹ = 20475340289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012211291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506105600 + 10506105601.

It is an arithmetic number, because the mean of its divisors is an integer number (10506105601).

Almost surely, 2^21012211201 is an apocalyptic number.

It is an amenable number.

21012211201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012211201 is an equidigital number, since it uses as much as digits as its factorization.

21012211201 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 21012211201 its reverse (10211221012), we get a palindrome (31223432213).

The spelling of 21012211201 in words is "twenty-one billion, twelve million, two hundred eleven thousand, two hundred one".