21111100210102 has 16 divisors (see below), whose sum is σ = 36929038269600. Its totient is φ = 9047614375464.

The previous prime is 21111100210063. The next prime is 21111100210111. The reversal of 21111100210102 is 20101200111112.

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 7 ways as a sum of consecutive naturals, for example, 15387098593 + ... + 15387099964.

It is an arithmetic number, because the mean of its divisors is an integer number (2308064891850).

Almost surely, 2^{21111100210102} is an apocalyptic number.

21111100210102 is a deficient number, since it is larger than the sum of its proper divisors (15817938059498).

21111100210102 is an equidigital number, since it uses as much as digits as its factorization.

21111100210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30774198580 (or 30774198566 counting only the distinct ones).

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

Adding to 21111100210102 its reverse (20101200111112), we get a palindrome (41212300321214).

The spelling of 21111100210102 in words is "twenty-one trillion, one hundred eleven billion, one hundred million, two hundred ten thousand, one hundred two".