21130124 has 6 divisors (see below), whose sum is σ = 36977724. Its totient is φ = 10565060.

The previous prime is 21130111. The next prime is 21130231. The reversal of 21130124 is 42103112.

It is a junction number, because it is equal to n+sod(n) for n = 21130099 and 21130108.

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 as a sum of consecutive naturals, namely, 2641262 + ... + 2641269.

It is an arithmetic number, because the mean of its divisors is an integer number (6162954).

Almost surely, 2^21130124 is an apocalyptic number.

It is an amenable number.

21130124 is a deficient number, since it is larger than the sum of its proper divisors (15847600).

21130124 is a wasteful number, since it uses less digits than its factorization.

21130124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5282535 (or 5282533 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21130124 is about 4596.7514616303. The cubic root of 21130124 is about 276.4610895218.

Adding to 21130124 its reverse (42103112), we get a palindrome (63233236).

The spelling of 21130124 in words is "twenty-one million, one hundred thirty thousand, one hundred twenty-four".