21745555375706 has 64 divisors (see below), whose sum is σ = 35140834713600. Its totient is φ = 10055908767744.

The previous prime is 21745555375693. The next prime is 21745555375729. The reversal of 21745555375706 is 60757355554712.

It is a happy number.

It is a super-2 number, since 2×21745555375706² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1697671430 + ... + 1697684238.

It is an arithmetic number, because the mean of its divisors is an integer number (549075542400).

Almost surely, 2^{21745555375706} is an apocalyptic number.

21745555375706 is a deficient number, since it is larger than the sum of its proper divisors (13395279337894).

21745555375706 is a wasteful number, since it uses less digits than its factorization.

21745555375706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16671.

The product of its (nonzero) digits is 154350000, while the sum is 62.

The spelling of 21745555375706 in words is "twenty-one trillion, seven hundred forty-five billion, five hundred fifty-five million, three hundred seventy-five thousand, seven hundred six".