21331211109 has 16 divisors (see below), whose sum is σ = 31148577600. Its totient is φ = 12904407936.

The previous prime is 21331211071. The next prime is 21331211113. The reversal of 21331211109 is 90111213312.

It is not a de Polignac number, because 21331211109 - 2¹¹ = 21331209061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331211809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4632904 + ... + 4637505.

It is an arithmetic number, because the mean of its divisors is an integer number (1946786100).

Almost surely, 2^21331211109 is an apocalyptic number.

It is an amenable number.

21331211109 is a deficient number, since it is larger than the sum of its proper divisors (9817366491).

21331211109 is a wasteful number, since it uses less digits than its factorization.

21331211109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9270484.

The product of its (nonzero) digits is 324, while the sum is 24.

The spelling of 21331211109 in words is "twenty-one billion, three hundred thirty-one million, two hundred eleven thousand, one hundred nine".