21723525370705 has 16 divisors (see below), whose sum is σ = 26678862270720. Its totient is φ = 16971865561728.

The previous prime is 21723525370691. The next prime is 21723525370759. The reversal of 21723525370705 is 50707352532712.

It is a cyclic number.

It is not a de Polignac number, because 21723525370705 - 2⁷ = 21723525370577 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7013065 + ... + 9624454.

It is an arithmetic number, because the mean of its divisors is an integer number (1667428891920).

Almost surely, 2^{21723525370705} is an apocalyptic number.

It is an amenable number.

21723525370705 is a deficient number, since it is larger than the sum of its proper divisors (4955336900015).

21723525370705 is a wasteful number, since it uses less digits than its factorization.

21723525370705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16643640.

The product of its (nonzero) digits is 3087000, while the sum is 49.

The spelling of 21723525370705 in words is "twenty-one trillion, seven hundred twenty-three billion, five hundred twenty-five million, three hundred seventy thousand, seven hundred five".