21165700111102 has 16 divisors (see below), whose sum is σ = 33841723438800. Its totient is φ = 9893481612928.

The previous prime is 21165700111081. The next prime is 21165700111123. The reversal of 21165700111102 is 20111100756112.

It is an interprime number because it is at equal distance from previous prime (21165700111081) and next prime (21165700111123).

It is a super-2 number, since 2×21165700111102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2088990208 + ... + 2089000339.

It is an arithmetic number, because the mean of its divisors is an integer number (2115107714925).

Almost surely, 2^{21165700111102} is an apocalyptic number.

21165700111102 is a deficient number, since it is larger than the sum of its proper divisors (12676023327698).

21165700111102 is a wasteful number, since it uses less digits than its factorization.

21165700111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177990715.

The product of its (nonzero) digits is 840, while the sum is 28.

Adding to 21165700111102 its reverse (20111100756112), we get a palindrome (41276800867214).

The spelling of 21165700111102 in words is "twenty-one trillion, one hundred sixty-five billion, seven hundred million, one hundred eleven thousand, one hundred two".