21041433340 has 24 divisors (see below), whose sum is σ = 46512642960. Its totient is φ = 7973595648.

The previous prime is 21041433271. The next prime is 21041433437. The reversal of 21041433340 is 4333414012.

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 7 ways as a sum of consecutive naturals, for example, 27685717 + ... + 27686476.

It is an arithmetic number, because the mean of its divisors is an integer number (1938026790).

Almost surely, 2^21041433340 is an apocalyptic number.

21041433340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21041433340 is an abundant number, since it is smaller than the sum of its proper divisors (25471209620).

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

21041433340 is a wasteful number, since it uses less digits than its factorization.

21041433340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55372221 (or 55372219 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21041433340 its reverse (4333414012), we get a palindrome (25374847352).

The spelling of 21041433340 in words is "twenty-one billion, forty-one million, four hundred thirty-three thousand, three hundred forty".