21222212010211 has 4 divisors (see below), whose sum is σ = 21222904197424. Its totient is φ = 21221519823000.

The previous prime is 21222212010191. The next prime is 21222212010217. The reversal of 21222212010211 is 11201021222212.

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 21222212010211 - 2¹¹ = 21222212008163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222212010217) 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, 346047615 + ... + 346108936.

It is an arithmetic number, because the mean of its divisors is an integer number (5305726049356).

Almost surely, 2^{21222212010211} is an apocalyptic number.

21222212010211 is a deficient number, since it is larger than the sum of its proper divisors (692187213).

21222212010211 is an equidigital number, since it uses as much as digits as its factorization.

21222212010211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692187212.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21222212010211 its reverse (11201021222212), we get a palindrome (32423233232423).

The spelling of 21222212010211 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, ten thousand, two hundred eleven".