21021120110 has 16 divisors (see below), whose sum is σ = 37853178336. Its totient is φ = 8405078688.

The previous prime is 21021120103. The next prime is 21021120149. The reversal of 21021120110 is 1102112012.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21021120091 and 21021120100.

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, 394889 + ... + 444948.

It is an arithmetic number, because the mean of its divisors is an integer number (2365823646).

Almost surely, 2^21021120110 is an apocalyptic number.

21021120110 is a deficient number, since it is larger than the sum of its proper divisors (16832058226).

21021120110 is a wasteful number, since it uses less digits than its factorization.

21021120110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842347.

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

Adding to 21021120110 its reverse (1102112012), we get a palindrome (22123232122).

The spelling of 21021120110 in words is "twenty-one billion, twenty-one million, one hundred twenty thousand, one hundred ten".