21100222011 has 32 divisors (see below), whose sum is σ = 32110571520. Its totient is φ = 12199572000.

The previous prime is 21100221997. The next prime is 21100222043. The reversal of 21100222011 is 11022200112.

It is not a de Polignac number, because 21100222011 - 2¹¹ = 21100219963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100222051) 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, 250986 + ... + 324336.

It is an arithmetic number, because the mean of its divisors is an integer number (1003455360).

Almost surely, 2^21100222011 is an apocalyptic number.

21100222011 is a deficient number, since it is larger than the sum of its proper divisors (11010349509).

21100222011 is a wasteful number, since it uses less digits than its factorization.

21100222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73767.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21100222011 its reverse (11022200112), we get a palindrome (32122422123).

The spelling of 21100222011 in words is "twenty-one billion, one hundred million, two hundred twenty-two thousand, eleven".