21001020021110 has 16 divisors (see below), whose sum is σ = 37831117111632. Its totient is φ = 8393901103200.

The previous prime is 21001020021103. The next prime is 21001020021167. The reversal of 21001020021110 is 1112002010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001020021091 and 21001020021100.

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, 813349601 + ... + 813375420.

It is an arithmetic number, because the mean of its divisors is an integer number (2364444819477).

Almost surely, 2^{21001020021110} is an apocalyptic number.

21001020021110 is a deficient number, since it is larger than the sum of its proper divisors (16830097090522).

21001020021110 is a wasteful number, since it uses less digits than its factorization.

21001020021110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626726319.

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

Adding to 21001020021110 its reverse (1112002010012), we get a palindrome (22113022031122).

The spelling of 21001020021110 in words is "twenty-one trillion, one billion, twenty million, twenty-one thousand, one hundred ten".