21130345 has 8 divisors (see below), whose sum is σ = 25387200. Its totient is φ = 16883760.

The previous prime is 21130331. The next prime is 21130397. The reversal of 21130345 is 54303112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21130345 - 2¹⁷ = 20999273 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3106 + ... + 7204.

It is an arithmetic number, because the mean of its divisors is an integer number (3173400).

Almost surely, 2^21130345 is an apocalyptic number.

It is an amenable number.

21130345 is a deficient number, since it is larger than the sum of its proper divisors (4256855).

21130345 is a wasteful number, since it uses less digits than its factorization.

21130345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5135.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21130345 is about 4596.7755002828. The cubic root of 21130345 is about 276.4620533541.

Adding to 21130345 its reverse (54303112), we get a palindrome (75433457).

The spelling of 21130345 in words is "twenty-one million, one hundred thirty thousand, three hundred forty-five".