21011201001211 has 16 divisors (see below), whose sum is σ = 21479092001280. Its totient is φ = 20544187191840.

The previous prime is 21011201001191. The next prime is 21011201001227. The reversal of 21011201001211 is 11210010211012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21011201001211 - 2¹⁷ = 21011200870139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011201001191 and 21011201001200.

It is not an unprimeable number, because it can be changed into a prime (21011201001251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234463065 + ... + 234552661.

It is an arithmetic number, because the mean of its divisors is an integer number (1342443250080).

Almost surely, 2^{21011201001211} is an apocalyptic number.

21011201001211 is a deficient number, since it is larger than the sum of its proper divisors (467891000069).

21011201001211 is a wasteful number, since it uses less digits than its factorization.

21011201001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94434.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21011201001211 its reverse (11210010211012), we get a palindrome (32221211212223).

The spelling of 21011201001211 in words is "twenty-one trillion, eleven billion, two hundred one million, one thousand, two hundred eleven".