21505002011702 has 32 divisors (see below), whose sum is σ = 35639804736000. Its totient is φ = 9650086336800.

The previous prime is 21505002011683. The next prime is 21505002011783. The reversal of 21505002011702 is 20711020050512.

It is a super-2 number, since 2×21505002011702² (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 15 ways as a sum of consecutive naturals, for example, 13535549 + ... + 15040647.

It is an arithmetic number, because the mean of its divisors is an integer number (1113743898000).

Almost surely, 2^{21505002011702} is an apocalyptic number.

21505002011702 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21505002011702 is a deficient number, since it is larger than the sum of its proper divisors (14134802724298).

21505002011702 is a wasteful number, since it uses less digits than its factorization.

21505002011702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513412.

The product of its (nonzero) digits is 1400, while the sum is 26.

The spelling of 21505002011702 in words is "twenty-one trillion, five hundred five billion, two million, eleven thousand, seven hundred two".