21022211122211 has 4 divisors (see below), whose sum is σ = 22639304285472. Its totient is φ = 19405117958952.

The previous prime is 21022211122201. The next prime is 21022211122223. The reversal of 21022211122211 is 11222111222012.

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 21022211122211 - 2²² = 21022206927907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022211122201) 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, 808546581611 + ... + 808546581636.

It is an arithmetic number, because the mean of its divisors is an integer number (5659826071368).

Almost surely, 2^{21022211122211} is an apocalyptic number.

21022211122211 is a deficient number, since it is larger than the sum of its proper divisors (1617093163261).

21022211122211 is a wasteful number, since it uses less digits than its factorization.

21022211122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617093163260.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21022211122211 its reverse (11222111222012), we get a palindrome (32244322344223).

The spelling of 21022211122211 in words is "twenty-one trillion, twenty-two billion, two hundred eleven million, one hundred twenty-two thousand, two hundred eleven".