21233122540 has 24 divisors (see below), whose sum is σ = 50959494432. Its totient is φ = 7279927680.

The previous prime is 21233122483. The next prime is 21233122577. The reversal of 21233122540 is 4522133212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75832441 + ... + 75832720.

It is an arithmetic number, because the mean of its divisors is an integer number (2123312268).

Almost surely, 2^21233122540 is an apocalyptic number.

21233122540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233122540 is an abundant number, since it is smaller than the sum of its proper divisors (29726371892).

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

21233122540 is a wasteful number, since it uses less digits than its factorization.

21233122540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151665177 (or 151665175 counting only the distinct ones).

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

Adding to 21233122540 its reverse (4522133212), we get a palindrome (25755255752).

The spelling of 21233122540 in words is "twenty-one billion, two hundred thirty-three million, one hundred twenty-two thousand, five hundred forty".