21100000102 has 16 divisors (see below), whose sum is σ = 31861089792. Its totient is φ = 10479722760.

The previous prime is 21100000069. The next prime is 21100000123. The reversal of 21100000102 is 20100000112.

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, 490723 + ... + 531985.

It is an arithmetic number, because the mean of its divisors is an integer number (1991318112).

Almost surely, 2^21100000102 is an apocalyptic number.

21100000102 is a deficient number, since it is larger than the sum of its proper divisors (10761089690).

21100000102 is a wasteful number, since it uses less digits than its factorization.

21100000102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42963.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21100000102 its reverse (20100000112), we get a palindrome (41200000214).

The spelling of 21100000102 in words is "twenty-one billion, one hundred million, one hundred two", and thus it is an aban number.