21113134209 has 12 divisors (see below), whose sum is σ = 30530384976. Its totient is φ = 14059898712.

The previous prime is 21113134201. The next prime is 21113134223. The reversal of 21113134209 is 90243131112.

21113134209 is a `hidden beast` number, since 211 + 13 + 13 + 420 + 9 = 666.

It is not a de Polignac number, because 21113134209 - 2³ = 21113134201 is a prime.

It is a super-2 number, since 2×21113134209² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21113134201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1285059 + ... + 1301384.

It is an arithmetic number, because the mean of its divisors is an integer number (2544198748).

Almost surely, 2^21113134209 is an apocalyptic number.

It is an amenable number.

21113134209 is a deficient number, since it is larger than the sum of its proper divisors (9417250767).

21113134209 is a wasteful number, since it uses less digits than its factorization.

21113134209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587356 (or 2587353 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The spelling of 21113134209 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-four thousand, two hundred nine".