21311824403983 has 8 divisors (see below), whose sum is σ = 21318821736480. Its totient is φ = 21304827704160.

The previous prime is 21311824403959. The next prime is 21311824404023. The reversal of 21311824403983 is 38930442811312.

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 21311824403983 - 2¹⁷ = 21311824272911 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 (21311824403953) 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, 72670038 + ... + 72962716.

It is an arithmetic number, because the mean of its divisors is an integer number (2664852717060).

Almost surely, 2^{21311824403983} is an apocalyptic number.

21311824403983 is a deficient number, since it is larger than the sum of its proper divisors (6997332497).

21311824403983 is a wasteful number, since it uses less digits than its factorization.

21311824403983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316337.

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 21311824403983 in words is "twenty-one trillion, three hundred eleven billion, eight hundred twenty-four million, four hundred three thousand, nine hundred eighty-three".