21645717101707 has 8 divisors (see below), whose sum is σ = 23045618860992. Its totient is φ = 20259884707200.

The previous prime is 21645717101689. The next prime is 21645717101753. The reversal of 21645717101707 is 70710171754612.

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 21645717101707 - 2⁷ = 21645717101579 is a prime.

It is a super-3 number, since 3×21645717101707³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21645717101807) 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, 3517338019 + ... + 3517344172.

It is an arithmetic number, because the mean of its divisors is an integer number (2880702357624).

Almost surely, 2^{21645717101707} is an apocalyptic number.

21645717101707 is a deficient number, since it is larger than the sum of its proper divisors (1399901759285).

21645717101707 is a wasteful number, since it uses less digits than its factorization.

21645717101707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034682389.

The product of its (nonzero) digits is 576240, while the sum is 49.

The spelling of 21645717101707 in words is "twenty-one trillion, six hundred forty-five billion, seven hundred seventeen million, one hundred one thousand, seven hundred seven".