21003013434 has 48 divisors (see below), whose sum is σ = 45621531072. Its totient is φ = 6443184384.

The previous prime is 21003013373. The next prime is 21003013463. The reversal of 21003013434 is 43431030012.

It is a super-2 number, since 2×21003013434² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003013434.

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 23 ways as a sum of consecutive naturals, for example, 310987 + ... + 372449.

It is an arithmetic number, because the mean of its divisors is an integer number (950448564).

Almost surely, 2^21003013434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21003013434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22810765536).

21003013434 is an abundant number, since it is smaller than the sum of its proper divisors (24618517638).

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

21003013434 is a wasteful number, since it uses less digits than its factorization.

21003013434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61831 (or 61818 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21003013434 its reverse (43431030012), we get a palindrome (64434043446).

The spelling of 21003013434 in words is "twenty-one billion, three million, thirteen thousand, four hundred thirty-four".