21123130124 has 12 divisors (see below), whose sum is σ = 36982457400. Its totient is φ = 10556713728.

The previous prime is 21123130087. The next prime is 21123130153. The reversal of 21123130124 is 42103132112.

It is a junction number, because it is equal to n+sod(n) for n = 21123130096 and 21123130105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1203029 + ... + 1220460.

It is an arithmetic number, because the mean of its divisors is an integer number (3081871450).

Almost surely, 2^21123130124 is an apocalyptic number.

It is an amenable number.

21123130124 is a deficient number, since it is larger than the sum of its proper divisors (15859327276).

21123130124 is a wasteful number, since it uses less digits than its factorization.

21123130124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425672 (or 2425670 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21123130124 its reverse (42103132112), we get a palindrome (63226262236).

The spelling of 21123130124 in words is "twenty-one billion, one hundred twenty-three million, one hundred thirty thousand, one hundred twenty-four".