21501233200 has 60 divisors (see below), whose sum is σ = 52113961368. Its totient is φ = 8524364800.

The previous prime is 21501233189. The next prime is 21501233219. The reversal of 21501233200 is 233210512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192646 + ... + 283045.

Almost surely, 2^21501233200 is an apocalyptic number.

21501233200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21501233200 is an abundant number, since it is smaller than the sum of its proper divisors (30612728168).

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

21501233200 is a wasteful number, since it uses less digits than its factorization.

21501233200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475822 (or 475811 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 21501233200 its reverse (233210512), we get a palindrome (21734443712).

The spelling of 21501233200 in words is "twenty-one billion, five hundred one million, two hundred thirty-three thousand, two hundred".