21433441240 has 16 divisors (see below), whose sum is σ = 48225242880. Its totient is φ = 8573376480.

The previous prime is 21433441231. The next prime is 21433441279. The reversal of 21433441240 is 4214433412.

It is a junction number, because it is equal to n+sod(n) for n = 21433441199 and 21433441208.

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 3 ways as a sum of consecutive naturals, for example, 267917976 + ... + 267918055.

It is an arithmetic number, because the mean of its divisors is an integer number (3014077680).

Almost surely, 2^21433441240 is an apocalyptic number.

21433441240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21433441240 is an abundant number, since it is smaller than the sum of its proper divisors (26791801640).

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

21433441240 is a wasteful number, since it uses less digits than its factorization.

21433441240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535836042 (or 535836038 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21433441240 its reverse (4214433412), we get a palindrome (25647874652).

The spelling of 21433441240 in words is "twenty-one billion, four hundred thirty-three million, four hundred forty-one thousand, two hundred forty".