21003042433 has 16 divisors (see below), whose sum is σ = 21226645440. Its totient is φ = 20781199296.

The previous prime is 21003042397. The next prime is 21003042439. The reversal of 21003042433 is 33424030012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21003042433 - 2²⁹ = 20466171521 is a prime.

It is a super-2 number, since 2×21003042433² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003042439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47410710 + ... + 47411152.

It is an arithmetic number, because the mean of its divisors is an integer number (1326665340).

Almost surely, 2^21003042433 is an apocalyptic number.

It is an amenable number.

21003042433 is a deficient number, since it is larger than the sum of its proper divisors (223603007).

21003042433 is a wasteful number, since it uses less digits than its factorization.

21003042433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21003042433 its reverse (33424030012), we get a palindrome (54427072445).

The spelling of 21003042433 in words is "twenty-one billion, three million, forty-two thousand, four hundred thirty-three".