21055000124 has 12 divisors (see below), whose sum is σ = 38448261264. Its totient is φ = 10069782624.

The previous prime is 21055000097. The next prime is 21055000159. The reversal of 21055000124 is 42100055012.

It is a junction number, because it is equal to n+sod(n) for n = 21055000096 and 21055000105.

It is a congruent number.

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, 114429257 + ... + 114429440.

It is an arithmetic number, because the mean of its divisors is an integer number (3204021772).

Almost surely, 2^21055000124 is an apocalyptic number.

It is an amenable number.

21055000124 is a deficient number, since it is larger than the sum of its proper divisors (17393261140).

21055000124 is a wasteful number, since it uses less digits than its factorization.

21055000124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228858724 (or 228858722 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 21055000124 its reverse (42100055012), we get a palindrome (63155055136).

The spelling of 21055000124 in words is "twenty-one billion, fifty-five million, one hundred twenty-four", and thus it is an aban number.