21122222011 has 32 divisors (see below), whose sum is σ = 23774026176. Its totient is φ = 18604800000.

The previous prime is 21122221973. The next prime is 21122222057. The reversal of 21122222011 is 11022222112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21122222011 - 2⁹ = 21122221499 is a prime.

It is a super-2 number, since 2×21122222011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122222071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11110161 + ... + 11112061.

It is an arithmetic number, because the mean of its divisors is an integer number (742938318).

Almost surely, 2^21122222011 is an apocalyptic number.

21122222011 is a deficient number, since it is larger than the sum of its proper divisors (2651804165).

21122222011 is a wasteful number, since it uses less digits than its factorization.

21122222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223.

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

Adding to 21122222011 its reverse (11022222112), we get a palindrome (32144444123).

It can be divided in two parts, 211 and 22222011, that added together give a palindrome (22222222).

The spelling of 21122222011 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, eleven".