21110221201 has 2 divisors, whose sum is σ = 21110221202. Its totient is φ = 21110221200.

The previous prime is 21110221183. The next prime is 21110221303. The reversal of 21110221201 is 10212201112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19606720576 + 1503500625 = 140024^2 + 38775^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110221201 - 2¹³ = 21110213009 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110221501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555110600 + 10555110601.

It is an arithmetic number, because the mean of its divisors is an integer number (10555110601).

Almost surely, 2^21110221201 is an apocalyptic number.

It is an amenable number.

21110221201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110221201 is an equidigital number, since it uses as much as digits as its factorization.

21110221201 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 21110221201 its reverse (10212201112), we get a palindrome (31322422313).

The spelling of 21110221201 in words is "twenty-one billion, one hundred ten million, two hundred twenty-one thousand, two hundred one".