21702577707671 has 4 divisors (see below), whose sum is σ = 24802945951632. Its totient is φ = 18602209463712.

The previous prime is 21702577707659. The next prime is 21702577707673. The reversal of 21702577707671 is 17670777520712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21702577707671 - 2⁶ = 21702577707607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21702577707671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21702577707673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1550184121970 + ... + 1550184121983.

It is an arithmetic number, because the mean of its divisors is an integer number (6200736487908).

Almost surely, 2^{21702577707671} is an apocalyptic number.

21702577707671 is a deficient number, since it is larger than the sum of its proper divisors (3100368243961).

21702577707671 is an equidigital number, since it uses as much as digits as its factorization.

21702577707671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100368243960.

The product of its (nonzero) digits is 14117880, while the sum is 59.

The spelling of 21702577707671 in words is "twenty-one trillion, seven hundred two billion, five hundred seventy-seven million, seven hundred seven thousand, six hundred seventy-one".