21111100309 has 8 divisors (see below), whose sum is σ = 23218755840. Its totient is φ = 19072548336.

The previous prime is 21111100289. The next prime is 21111100343. The reversal of 21111100309 is 90300111112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111100309 - 2⁷ = 21111100181 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 (21111100349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17275249 + ... + 17276470.

It is an arithmetic number, because the mean of its divisors is an integer number (2902344480).

Almost surely, 2^21111100309 is an apocalyptic number.

It is an amenable number.

21111100309 is a deficient number, since it is larger than the sum of its proper divisors (2107655531).

21111100309 is a wasteful number, since it uses less digits than its factorization.

21111100309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34551779.

The product of its (nonzero) digits is 54, while the sum is 19.

The spelling of 21111100309 in words is "twenty-one billion, one hundred eleven million, one hundred thousand, three hundred nine".