21001011112102 has 16 divisors (see below), whose sum is σ = 36879824392992. Its totient is φ = 8780910569280.

The previous prime is 21001011112087. The next prime is 21001011112141. The reversal of 21001011112102 is 20121111010012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18293563113 + ... + 18293564260.

It is an arithmetic number, because the mean of its divisors is an integer number (2304989024562).

Almost surely, 2^{21001011112102} is an apocalyptic number.

21001011112102 is a deficient number, since it is larger than the sum of its proper divisors (15878813280890).

21001011112102 is a wasteful number, since it uses less digits than its factorization.

21001011112102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36587127423.

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

Adding to 21001011112102 its reverse (20121111010012), we get a palindrome (41122122122114).

The spelling of 21001011112102 in words is "twenty-one trillion, one billion, eleven million, one hundred twelve thousand, one hundred two".