21011111111102 has 32 divisors (see below), whose sum is σ = 36354346463232. Its totient is φ = 8921285741664.

The previous prime is 21011111111099. The next prime is 21011111111117. The reversal of 21011111111102 is 20111111111012.

It is a super-3 number, since 3×21011111111102³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 13799198 + ... + 15245985.

It is an arithmetic number, because the mean of its divisors is an integer number (1136073326976).

Almost surely, 2^{21011111111102} is an apocalyptic number.

21011111111102 is a deficient number, since it is larger than the sum of its proper divisors (15343235352130).

21011111111102 is a wasteful number, since it uses less digits than its factorization.

21011111111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29045672.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 21011111111102 its reverse (20111111111012), we get a palindrome (41122222222114).

The spelling of 21011111111102 in words is "twenty-one trillion, eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred two".