21120110 has 32 divisors (see below), whose sum is σ = 41904864. Its totient is φ = 7600000.

The previous prime is 21120109. The next prime is 21120119. The reversal of 21120110 is 1102112.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10160 + ... + 12060.

It is an arithmetic number, because the mean of its divisors is an integer number (1309527).

Almost surely, 2^21120110 is an apocalyptic number.

21120110 is a deficient number, since it is larger than the sum of its proper divisors (20784754).

21120110 is a wasteful number, since it uses less digits than its factorization.

21120110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 21120110 is about 4595.6620850537. The cubic root of 21120110 is about 276.4174090901.

Adding to 21120110 its reverse (1102112), we get a palindrome (22222222).

The spelling of 21120110 in words is "twenty-one million, one hundred twenty thousand, one hundred ten".