21000012221211 has 32 divisors (see below), whose sum is σ = 28954682803200. Its totient is φ = 13532122206720.

The previous prime is 21000012221203. The next prime is 21000012221257. The reversal of 21000012221211 is 11212221000012.

It is not a de Polignac number, because 21000012221211 - 2³ = 21000012221203 is a prime.

It is a super-2 number, since 2×21000012221211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21000012229211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254085 + ... + 6485721.

It is an arithmetic number, because the mean of its divisors is an integer number (904833837600).

Almost surely, 2^{21000012221211} is an apocalyptic number.

21000012221211 is a deficient number, since it is larger than the sum of its proper divisors (7954670581989).

21000012221211 is a wasteful number, since it uses less digits than its factorization.

21000012221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6232019.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21000012221211 its reverse (11212221000012), we get a palindrome (32212233221223).

The spelling of 21000012221211 in words is "twenty-one trillion, twelve million, two hundred twenty-one thousand, two hundred eleven".