21112101010102 has 64 divisors (see below), whose sum is σ = 33818356915200. Its totient is φ = 9855911070720.

The previous prime is 21112101010079. The next prime is 21112101010123. The reversal of 21112101010102 is 20101010121112.

It is a happy number.

It is a congruent number.

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, 5160619077 + ... + 5160623167.

It is an arithmetic number, because the mean of its divisors is an integer number (528411826800).

Almost surely, 2^{21112101010102} is an apocalyptic number.

21112101010102 is a deficient number, since it is larger than the sum of its proper divisors (12706255905098).

21112101010102 is a wasteful number, since it uses less digits than its factorization.

21112101010102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6901.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21112101010102 its reverse (20101010121112), we get a palindrome (41213111131214).

It can be divided in two parts, 211121010 and 10102, that added together give a palindrome (211131112).

The spelling of 21112101010102 in words is "twenty-one trillion, one hundred twelve billion, one hundred one million, ten thousand, one hundred two".