21121002110 has 64 divisors (see below), whose sum is σ = 43155201600. Its totient is φ = 7378117632.

The previous prime is 21121002107. The next prime is 21121002121. The reversal of 21121002110 is 1120012112.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21121002091 and 21121002100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1963226 + ... + 1973954.

It is an arithmetic number, because the mean of its divisors is an integer number (674300025).

Almost surely, 2^21121002110 is an apocalyptic number.

21121002110 is an abundant number, since it is smaller than the sum of its proper divisors (22034199490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121002110 is a wasteful number, since it uses less digits than its factorization.

21121002110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11565.

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

Adding to 21121002110 its reverse (1120012112), we get a palindrome (22241014222).

The spelling of 21121002110 in words is "twenty-one billion, one hundred twenty-one million, two thousand, one hundred ten".