21350805239673 has 288 divisors, whose sum is σ = 40969956867840. Its totient is φ = 10601672739840.

The previous prime is 21350805239663. The next prime is 21350805239681. The reversal of 21350805239673 is 37693250805312.

21350805239673 is a `hidden beast` number, since 2 + 1 + 3 + 50 + 8 + 0 + 523 + 9 + 67 + 3 = 666.

It is not a de Polignac number, because 21350805239673 - 2⁹ = 21350805239161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21350805239633) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 4511048815 + ... + 4511053547.

It is an arithmetic number, because the mean of its divisors is an integer number (142256794680).

Almost surely, 2^{21350805239673} is an apocalyptic number.

It is an amenable number.

21350805239673 is a deficient number, since it is larger than the sum of its proper divisors (19619151628167).

21350805239673 is a wasteful number, since it uses less digits than its factorization.

21350805239673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5469 (or 5459 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 54.

The spelling of 21350805239673 in words is "twenty-one trillion, three hundred fifty billion, eight hundred five million, two hundred thirty-nine thousand, six hundred seventy-three".