21433100240 has 20 divisors (see below), whose sum is σ = 49831958244. Its totient is φ = 8573240064.

The previous prime is 21433100207. The next prime is 21433100257. The reversal of 21433100240 is 4200133412.

It can be written as a sum of positive squares in 2 ways, for example, as 15717135424 + 5715964816 = 125368^2 + 75604^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133956797 + ... + 133956956.

Almost surely, 2^21433100240 is an apocalyptic number.

21433100240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21433100240 is an abundant number, since it is smaller than the sum of its proper divisors (28398858004).

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

21433100240 is a wasteful number, since it uses less digits than its factorization.

21433100240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267913766 (or 267913760 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21433100240 its reverse (4200133412), we get a palindrome (25633233652).

The spelling of 21433100240 in words is "twenty-one billion, four hundred thirty-three million, one hundred thousand, two hundred forty".