21102111120104 has 128 divisors (see below), whose sum is σ = 45869142931200. Its totient is φ = 8914356633600.

The previous prime is 21102111120073. The next prime is 21102111120121. The reversal of 21102111120104 is 40102111120112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6369485552 + ... + 6369488864.

It is an arithmetic number, because the mean of its divisors is an integer number (358352679150).

Almost surely, 2^{21102111120104} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102111120104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22934571465600).

21102111120104 is an abundant number, since it is smaller than the sum of its proper divisors (24767031811096).

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

21102111120104 is a wasteful number, since it uses less digits than its factorization.

21102111120104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003 (or 6999 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21102111120104 its reverse (40102111120112), we get a palindrome (61204222240216).

The spelling of 21102111120104 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, one hundred twenty thousand, one hundred four".