21102111220102 has 32 divisors (see below), whose sum is σ = 36563036135040. Its totient is φ = 9027372170880.

The previous prime is 21102111220063. The next prime is 21102111220147. The reversal of 21102111220102 is 20102211120112.

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, 11989393 + ... + 13636339.

It is an arithmetic number, because the mean of its divisors is an integer number (1142594879220).

Almost surely, 2^{21102111220102} is an apocalyptic number.

21102111220102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21102111220102 is a deficient number, since it is larger than the sum of its proper divisors (15460924914938).

21102111220102 is a wasteful number, since it uses less digits than its factorization.

21102111220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681236.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21102111220102 its reverse (20102211120112), we get a palindrome (41204322340214).

The spelling of 21102111220102 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, two hundred twenty thousand, one hundred two".