21000112102 has 16 divisors (see below), whose sum is σ = 33486375600. Its totient is φ = 9848930400.

The previous prime is 21000112061. The next prime is 21000112127. The reversal of 21000112102 is 20121100012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2731977 + ... + 2739652.

It is an arithmetic number, because the mean of its divisors is an integer number (2092898475).

Almost surely, 2^21000112102 is an apocalyptic number.

21000112102 is a deficient number, since it is larger than the sum of its proper divisors (12486263498).

21000112102 is a wasteful number, since it uses less digits than its factorization.

21000112102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5471751.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000112102 its reverse (20121100012), we get a palindrome (41121212114).

The spelling of 21000112102 in words is "twenty-one billion, one hundred twelve thousand, one hundred two".