21433135340 has 24 divisors (see below), whose sum is σ = 45858823920. Its totient is φ = 8411494208.

The previous prime is 21433135337. The next prime is 21433135349. The reversal of 21433135340 is 4353133412.

It is not an unprimeable number, because it can be changed into a prime (21433135349) by changing a digit.

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, 10108910 + ... + 10111029.

It is an arithmetic number, because the mean of its divisors is an integer number (1910784330).

Almost surely, 2^21433135340 is an apocalyptic number.

21433135340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21433135340 is an abundant number, since it is smaller than the sum of its proper divisors (24425688580).

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

21433135340 is a wasteful number, since it uses less digits than its factorization.

21433135340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20220001 (or 20219999 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 21433135340 its reverse (4353133412), we get a palindrome (25786268752).

The spelling of 21433135340 in words is "twenty-one billion, four hundred thirty-three million, one hundred thirty-five thousand, three hundred forty".