21100022011 has 8 divisors (see below), whose sum is σ = 21409950240. Its totient is φ = 20791712832.

The previous prime is 21100021993. The next prime is 21100022023. The reversal of 21100022011 is 11022000112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21100022011 - 2⁹ = 21100021499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100022071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378495 + ... + 430648.

It is an arithmetic number, because the mean of its divisors is an integer number (2676243780).

Almost surely, 2^21100022011 is an apocalyptic number.

21100022011 is a deficient number, since it is larger than the sum of its proper divisors (309928229).

21100022011 is an equidigital number, since it uses as much as digits as its factorization.

21100022011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809525.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21100022011 its reverse (11022000112), we get a palindrome (32122022123).

The spelling of 21100022011 in words is "twenty-one billion, one hundred million, twenty-two thousand, eleven".