21433210240 has 64 divisors (see below), whose sum is σ = 55180233360. Its totient is φ = 7913797632.

The previous prime is 21433210237. The next prime is 21433210247. The reversal of 21433210240 is 4201233412.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433210247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1279734 + ... + 1296373.

Almost surely, 2^21433210240 is an apocalyptic number.

21433210240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21433210240 is an abundant number, since it is smaller than the sum of its proper divisors (33747023120).

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

21433210240 is a wasteful number, since it uses less digits than its factorization.

21433210240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576139 (or 2576127 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21433210240 its reverse (4201233412), we get a palindrome (25634443652).

The spelling of 21433210240 in words is "twenty-one billion, four hundred thirty-three million, two hundred ten thousand, two hundred forty".