21109044211 has 4 divisors (see below), whose sum is σ = 22350752712. Its totient is φ = 19867335712.

The previous prime is 21109044199. The next prime is 21109044223. The reversal of 21109044211 is 11244090112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21109044199) and next prime (21109044223).

It is a cyclic number.

It is not a de Polignac number, because 21109044211 - 2¹⁷ = 21108913139 is a prime.

It is a super-2 number, since 2×21109044211² (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 (21109044311) 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, 620854225 + ... + 620854258.

It is an arithmetic number, because the mean of its divisors is an integer number (5587688178).

Almost surely, 2^21109044211 is an apocalyptic number.

21109044211 is a deficient number, since it is larger than the sum of its proper divisors (1241708501).

21109044211 is a wasteful number, since it uses less digits than its factorization.

21109044211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241708500.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 21109044211 in words is "twenty-one billion, one hundred nine million, forty-four thousand, two hundred eleven".