21111102102 has 16 divisors (see below), whose sum is σ = 43678142640. Its totient is φ = 6794377632.

The previous prime is 21111102097. The next prime is 21111102119. The reversal of 21111102102 is 20120111112.

It is a super-2 number, since 2×21111102102² (a number of 21 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, 60663913 + ... + 60664260.

It is an arithmetic number, because the mean of its divisors is an integer number (2729883915).

Almost surely, 2^21111102102 is an apocalyptic number.

21111102102 is an abundant number, since it is smaller than the sum of its proper divisors (22567040538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111102102 is a wasteful number, since it uses less digits than its factorization.

21111102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121328207.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111102102 its reverse (20120111112), we get a palindrome (41231213214).

The spelling of 21111102102 in words is "twenty-one billion, one hundred eleven million, one hundred two thousand, one hundred two".