21505002011708 has 24 divisors (see below), whose sum is σ = 38892815025120. Its totient is φ = 10397410849280.

The previous prime is 21505002011683. The next prime is 21505002011783. The reversal of 21505002011708 is 80711020050512.

It is a super-2 number, since 2×21505002011708² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580194128 + ... + 580231191.

It is an arithmetic number, because the mean of its divisors is an integer number (1620533959380).

Almost surely, 2^{21505002011708} is an apocalyptic number.

It is an amenable number.

21505002011708 is a deficient number, since it is larger than the sum of its proper divisors (17387813013412).

21505002011708 is a wasteful number, since it uses less digits than its factorization.

21505002011708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160425477 (or 1160425475 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 32.

The spelling of 21505002011708 in words is "twenty-one trillion, five hundred five billion, two million, eleven thousand, seven hundred eight".