21433510240 has 96 divisors (see below), whose sum is σ = 55464302880. Its totient is φ = 7790813184.

The previous prime is 21433510237. The next prime is 21433510243. The reversal of 21433510240 is 4201533412.

It is an interprime number because it is at equal distance from previous prime (21433510237) and next prime (21433510243).

It is a super-2 number, since 2×21433510240² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433510243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56982 + ... + 214741.

It is an arithmetic number, because the mean of its divisors is an integer number (577753155).

Almost surely, 2^21433510240 is an apocalyptic number.

21433510240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21433510240 is an abundant number, since it is smaller than the sum of its proper divisors (34030792640).

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

21433510240 is a wasteful number, since it uses less digits than its factorization.

21433510240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271784 (or 271776 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 21433510240 in words is "twenty-one billion, four hundred thirty-three million, five hundred ten thousand, two hundred forty".