21130011 has 16 divisors (see below), whose sum is σ = 35776000. Its totient is φ = 12074184.

The previous prime is 21130001. The next prime is 21130027. The reversal of 21130011 is 11003112.

It is not a de Polignac number, because 21130011 - 2⁶ = 21129947 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21129975 and 21130002.

It is not an unprimeable number, because it can be changed into a prime (21130001) 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, 55711 + ... + 56088.

It is an arithmetic number, because the mean of its divisors is an integer number (2236000).

Almost surely, 2^21130011 is an apocalyptic number.

21130011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21130011 is a deficient number, since it is larger than the sum of its proper divisors (14645989).

21130011 is a wasteful number, since it uses less digits than its factorization.

21130011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111815 (or 111809 counting only the distinct ones).

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

The square root of 21130011 is about 4596.7391703250. The cubic root of 21130011 is about 276.4605967000.

Adding to 21130011 its reverse (11003112), we get a palindrome (32133123).

The spelling of 21130011 in words is "twenty-one million, one hundred thirty thousand, eleven".