21115683287999 has 8 divisors (see below), whose sum is σ = 21970075102560. Its totient is φ = 20269709127136.

The previous prime is 21115683287891. The next prime is 21115683288013. The reversal of 21115683287999 is 99978238651112.

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 21115683287999 - 2³² = 21111388320703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115683287299) 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, 2104408307 + ... + 2104418340.

It is an arithmetic number, because the mean of its divisors is an integer number (2746259387820).

Almost surely, 2^{21115683287999} is an apocalyptic number.

21115683287999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21115683287999 is a deficient number, since it is larger than the sum of its proper divisors (854391814561).

21115683287999 is a wasteful number, since it uses less digits than its factorization.

21115683287999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208826849.

The product of its digits is 117573120, while the sum is 71.

The spelling of 21115683287999 in words is "twenty-one trillion, one hundred fifteen billion, six hundred eighty-three million, two hundred eighty-seven thousand, nine hundred ninety-nine".