21001021100102 has 16 divisors (see below), whose sum is σ = 32426785756512. Its totient is φ = 10196177521920.

The previous prime is 21001021100099. The next prime is 21001021100141. The reversal of 21001021100102 is 20100112010012.

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, 1021241474 + ... + 1021262037.

It is an arithmetic number, because the mean of its divisors is an integer number (2026674109782).

Almost surely, 2^{21001021100102} is an apocalyptic number.

21001021100102 is a deficient number, since it is larger than the sum of its proper divisors (11425764656410).

21001021100102 is a wasteful number, since it uses less digits than its factorization.

21001021100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042503663.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21001021100102 its reverse (20100112010012), we get a palindrome (41101133110114).

The spelling of 21001021100102 in words is "twenty-one trillion, one billion, twenty-one million, one hundred thousand, one hundred two".