21222122011 has 32 divisors (see below), whose sum is σ = 23379406848. Its totient is φ = 19202641920.

The previous prime is 21222121993. The next prime is 21222122027. The reversal of 21222122011 is 11022122212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21222122011 - 2⁷ = 21222121883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222122071) 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, 5738515 + ... + 5742211.

It is an arithmetic number, because the mean of its divisors is an integer number (730606464).

Almost surely, 2^21222122011 is an apocalyptic number.

21222122011 is a deficient number, since it is larger than the sum of its proper divisors (2157284837).

21222122011 is a wasteful number, since it uses less digits than its factorization.

21222122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931.

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

Adding to 21222122011 its reverse (11022122212), we get a palindrome (32244244223).

The spelling of 21222122011 in words is "twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, eleven".