21013002424 has 64 divisors (see below), whose sum is σ = 41932800000. Its totient is φ = 9843700608.

The previous prime is 21013002403. The next prime is 21013002431. The reversal of 21013002424 is 42420031012.

It is a super-3 number, since 3×21013002424³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6735537 + ... + 6738655.

It is an arithmetic number, because the mean of its divisors is an integer number (655200000).

Almost surely, 2^21013002424 is an apocalyptic number.

It is an amenable number.

21013002424 is a deficient number, since it is larger than the sum of its proper divisors (20919797576).

21013002424 is a wasteful number, since it uses less digits than its factorization.

21013002424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620 (or 3616 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21013002424 its reverse (42420031012), we get a palindrome (63433033436).

The spelling of 21013002424 in words is "twenty-one billion, thirteen million, two thousand, four hundred twenty-four".