21220202001211 has 4 divisors (see below), whose sum is σ = 21221675538424. Its totient is φ = 21218728464000.

The previous prime is 21220202001161. The next prime is 21220202001253. The reversal of 21220202001211 is 11210020202212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21220202001211 - 2¹⁷ = 21220201870139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220502001211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 736747005 + ... + 736775806.

It is an arithmetic number, because the mean of its divisors is an integer number (5305418884606).

Almost surely, 2^{21220202001211} is an apocalyptic number.

21220202001211 is a deficient number, since it is larger than the sum of its proper divisors (1473537213).

21220202001211 is a wasteful number, since it uses less digits than its factorization.

21220202001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473537212.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220202001211 its reverse (11210020202212), we get a palindrome (32430222203423).

It can be divided in two parts, 21220202001 and 211, that added together give a palindrome (21220202212).

The spelling of 21220202001211 in words is "twenty-one trillion, two hundred twenty billion, two hundred two million, one thousand, two hundred eleven".