21100102102 has 16 divisors (see below), whose sum is σ = 32566622832. Its totient is φ = 10248503200.

The previous prime is 21100102097. The next prime is 21100102151. The reversal of 21100102102 is 20120100112.

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, 974728 + ... + 996139.

It is an arithmetic number, because the mean of its divisors is an integer number (2035413927).

Almost surely, 2^21100102102 is an apocalyptic number.

21100102102 is a deficient number, since it is larger than the sum of its proper divisors (11466520730).

21100102102 is a wasteful number, since it uses less digits than its factorization.

21100102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971023.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21100102102 its reverse (20120100112), we get a palindrome (41220202214).

It can be divided in two parts, 2110010 and 2102, that added together give a palindrome (2112112).

The spelling of 21100102102 in words is "twenty-one billion, one hundred million, one hundred two thousand, one hundred two".