21220111001211 has 32 divisors (see below), whose sum is σ = 29794087699200. Its totient is φ = 13414616100480.

The previous prime is 21220111001191. The next prime is 21220111001267. The reversal of 21220111001211 is 11210011102212.

It is a happy number.

It is not a de Polignac number, because 21220111001211 - 2¹¹ = 21220110999163 is a prime.

It is a super-2 number, since 2×21220111001211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220111001281) 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, 463540 + ... + 6531086.

It is an arithmetic number, because the mean of its divisors is an integer number (931065240600).

Almost surely, 2^{21220111001211} is an apocalyptic number.

21220111001211 is a deficient number, since it is larger than the sum of its proper divisors (8573976697989).

21220111001211 is a wasteful number, since it uses less digits than its factorization.

21220111001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6068299.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21220111001211 its reverse (11210011102212), we get a palindrome (32430122103423).

The spelling of 21220111001211 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, one thousand, two hundred eleven".