21019130 has 64 divisors (see below), whose sum is σ = 44323200. Its totient is φ = 7096320.

The previous prime is 21019129. The next prime is 21019151. The reversal of 21019130 is 3191012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21019099 and 21019108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185954 + ... + 186066.

It is an arithmetic number, because the mean of its divisors is an integer number (692550).

Almost surely, 2^21019130 is an apocalyptic number.

21019130 is an abundant number, since it is smaller than the sum of its proper divisors (23304070).

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

21019130 is a wasteful number, since it uses less digits than its factorization.

21019130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 21019130 is about 4584.6624739451. The cubic root of 21019130 is about 275.9761671642.

The spelling of 21019130 in words is "twenty-one million, nineteen thousand, one hundred thirty".