21329911109 has 16 divisors (see below), whose sum is σ = 23445081072. Its totient is φ = 19283816448.

The previous prime is 21329911063. The next prime is 21329911121. The reversal of 21329911109 is 90111992312.

It can be written as a sum of positive squares in 8 ways, for example, as 184900 + 21329726209 = 430^2 + 146047^2 .

It is not a de Polignac number, because 21329911109 - 2¹² = 21329907013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21329911609) 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, 370727 + ... + 424379.

It is an arithmetic number, because the mean of its divisors is an integer number (1465317567).

Almost surely, 2^21329911109 is an apocalyptic number.

It is an amenable number.

21329911109 is a deficient number, since it is larger than the sum of its proper divisors (2115169963).

21329911109 is a wasteful number, since it uses less digits than its factorization.

21329911109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54296.

The product of its (nonzero) digits is 8748, while the sum is 38.

The spelling of 21329911109 in words is "twenty-one billion, three hundred twenty-nine million, nine hundred eleven thousand, one hundred nine".