21533004340 has 48 divisors (see below), whose sum is σ = 47224114560. Its totient is φ = 8231949440.

The previous prime is 21533004301. The next prime is 21533004359. The reversal of 21533004340 is 4340033512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560550 + ... + 597730.

It is an arithmetic number, because the mean of its divisors is an integer number (983835720).

Almost surely, 2^21533004340 is an apocalyptic number.

21533004340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533004340 is an abundant number, since it is smaller than the sum of its proper divisors (25691110220).

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

21533004340 is a wasteful number, since it uses less digits than its factorization.

21533004340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38472 (or 38470 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 21533004340 its reverse (4340033512), we get a palindrome (25873037852).

The spelling of 21533004340 in words is "twenty-one billion, five hundred thirty-three million, four thousand, three hundred forty".