21130110 has 48 divisors (see below), whose sum is σ = 55171584. Its totient is φ = 5610816.

The previous prime is 21130079. The next prime is 21130111. The reversal of 21130110 is 1103112.

It is a super-2 number, since 2×21130110² = 892963097224200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21130092 and 21130101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34164 + ... + 34776.

It is an arithmetic number, because the mean of its divisors is an integer number (1149408).

Almost surely, 2^21130110 is an apocalyptic number.

21130110 is an abundant number, since it is smaller than the sum of its proper divisors (34041474).

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

21130110 is a wasteful number, since it uses less digits than its factorization.

21130110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 1006 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 21130110 is about 4596.7499388155. The cubic root of 21130110 is about 276.4610284643.

Adding to 21130110 its reverse (1103112), we get a palindrome (22233222).

The spelling of 21130110 in words is "twenty-one million, one hundred thirty thousand, one hundred ten".