21011003124 has 12 divisors (see below), whose sum is σ = 49025673984. Its totient is φ = 7003667704.

The previous prime is 21011003119. The next prime is 21011003161. The reversal of 21011003124 is 42130011012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×21011003124³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875458452 + ... + 875458475.

It is an arithmetic number, because the mean of its divisors is an integer number (4085472832).

Almost surely, 2^21011003124 is an apocalyptic number.

It is an amenable number.

21011003124 is an abundant number, since it is smaller than the sum of its proper divisors (28014670860).

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

21011003124 is a wasteful number, since it uses less digits than its factorization.

21011003124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750916934 (or 1750916932 counting only the distinct ones).

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

Adding to 21011003124 its reverse (42130011012), we get a palindrome (63141014136).

The spelling of 21011003124 in words is "twenty-one billion, eleven million, three thousand, one hundred twenty-four".