21010012201 has 2 divisors, whose sum is σ = 21010012202. Its totient is φ = 21010012200.

The previous prime is 21010012189. The next prime is 21010012271. The reversal of 21010012201 is 10221001012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17666397225 + 3343614976 = 132915^2 + 57824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010012201 - 2¹³ = 21010004009 is a prime.

It is a super-2 number, since 2×21010012201² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21010012271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505006100 + 10505006101.

It is an arithmetic number, because the mean of its divisors is an integer number (10505006101).

Almost surely, 2^21010012201 is an apocalyptic number.

It is an amenable number.

21010012201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010012201 is an equidigital number, since it uses as much as digits as its factorization.

21010012201 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 10.

Adding to 21010012201 its reverse (10221001012), we get a palindrome (31231013213).

The spelling of 21010012201 in words is "twenty-one billion, ten million, twelve thousand, two hundred one".