21122113209 has 8 divisors (see below), whose sum is σ = 28165106112. Its totient is φ = 14080264560.

The previous prime is 21122113171. The next prime is 21122113219. The reversal of 21122113209 is 90231122112.

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

It is not a de Polignac number, because 21122113209 - 2⁷ = 21122113081 is a prime.

It is a super-2 number, since 2×21122113209² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21122113219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242022 + ... + 317519.

It is an arithmetic number, because the mean of its divisors is an integer number (3520638264).

Almost surely, 2^21122113209 is an apocalyptic number.

It is an amenable number.

21122113209 is a deficient number, since it is larger than the sum of its proper divisors (7042992903).

21122113209 is a wasteful number, since it uses less digits than its factorization.

21122113209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572127.

The product of its (nonzero) digits is 432, while the sum is 24.

The spelling of 21122113209 in words is "twenty-one billion, one hundred twenty-two million, one hundred thirteen thousand, two hundred nine".