21000032123209 has 8 divisors (see below), whose sum is σ = 21379407258240. Its totient is φ = 20621438401200.

The previous prime is 21000032123159. The next prime is 21000032123293. The reversal of 21000032123209 is 90232123000012.

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 21000032123209 - 2¹⁵ = 21000032090441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000032123909) 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, 195299022 + ... + 195406519.

It is an arithmetic number, because the mean of its divisors is an integer number (2672425907280).

Almost surely, 2^{21000032123209} is an apocalyptic number.

It is an amenable number.

21000032123209 is a deficient number, since it is larger than the sum of its proper divisors (379375135031).

21000032123209 is an equidigital number, since it uses as much as digits as its factorization.

21000032123209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390706511.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 21000032123209 in words is "twenty-one trillion, thirty-two million, one hundred twenty-three thousand, two hundred nine".