21010013124 has 24 divisors (see below), whose sum is σ = 49033467840. Its totient is φ = 7001894304.

The previous prime is 21010013117. The next prime is 21010013137. The reversal of 21010013124 is 42131001012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118939 + ... + 236994.

It is an arithmetic number, because the mean of its divisors is an integer number (2043061160).

Almost surely, 2^21010013124 is an apocalyptic number.

It is an amenable number.

21010013124 is an abundant number, since it is smaller than the sum of its proper divisors (28023454716).

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

21010013124 is a wasteful number, since it uses less digits than its factorization.

21010013124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360859 (or 360857 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21010013124 its reverse (42131001012), we get a palindrome (63141014136).

The spelling of 21010013124 in words is "twenty-one billion, ten million, thirteen thousand, one hundred twenty-four".