21220200121211 has 16 divisors (see below), whose sum is σ = 26117603198400. Its totient is φ = 16789330003968.

The previous prime is 21220200121157. The next prime is 21220200121223. The reversal of 21220200121211 is 11212100202212.

It is a cyclic number.

It is not a de Polignac number, because 21220200121211 - 2³⁰ = 21219126379387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220200121211.

It is not an unprimeable number, because it can be changed into a prime (21220200141211) 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, 3660275 + ... + 7472483.

It is an arithmetic number, because the mean of its divisors is an integer number (1632350199900).

Almost surely, 2^{21220200121211} is an apocalyptic number.

21220200121211 is a deficient number, since it is larger than the sum of its proper divisors (4897403077189).

21220200121211 is a wasteful number, since it uses less digits than its factorization.

21220200121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3873398.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220200121211 its reverse (11212100202212), we get a palindrome (32432300323423).

The spelling of 21220200121211 in words is "twenty-one trillion, two hundred twenty billion, two hundred million, one hundred twenty-one thousand, two hundred eleven".