21333235540 has 24 divisors (see below), whose sum is σ = 46747612800. Its totient is φ = 8162281248.

The previous prime is 21333235537. The next prime is 21333235543. The reversal of 21333235540 is 4553233312.

It is an interprime number because it is at equal distance from previous prime (21333235537) and next prime (21333235543).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333235543) 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, 23187840 + ... + 23188759.

It is an arithmetic number, because the mean of its divisors is an integer number (1947817200).

Almost surely, 2^21333235540 is an apocalyptic number.

21333235540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21333235540 is an abundant number, since it is smaller than the sum of its proper divisors (25414377260).

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

21333235540 is a wasteful number, since it uses less digits than its factorization.

21333235540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46376631 (or 46376629 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 31.

Adding to 21333235540 its reverse (4553233312), we get a palindrome (25886468852).

The spelling of 21333235540 in words is "twenty-one billion, three hundred thirty-three million, two hundred thirty-five thousand, five hundred forty".