21645717101706 has 32 divisors (see below), whose sum is σ = 43739283365568. Its totient is φ = 7140602764800.

The previous prime is 21645717101689. The next prime is 21645717101753. The reversal of 21645717101706 is 60710171754612.

It is a super-2 number, since 2×21645717101706² (a number of 27 digits) contains 22 as substring.

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, 16196281 + ... + 17481731.

It is an arithmetic number, because the mean of its divisors is an integer number (1366852605174).

Almost surely, 2^{21645717101706} is an apocalyptic number.

21645717101706 is an abundant number, since it is smaller than the sum of its proper divisors (22093566263862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21645717101706 is a wasteful number, since it uses less digits than its factorization.

21645717101706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314486.

The product of its (nonzero) digits is 493920, while the sum is 48.

The spelling of 21645717101706 in words is "twenty-one trillion, six hundred forty-five billion, seven hundred seventeen million, one hundred one thousand, seven hundred six".