21201032240 has 40 divisors (see below), whose sum is σ = 49353330768. Its totient is φ = 8469930240.

The previous prime is 21201032191. The next prime is 21201032317. The reversal of 21201032240 is 4223010212.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98507 + ... + 228266.

Almost surely, 2^21201032240 is an apocalyptic number.

21201032240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201032240 is an abundant number, since it is smaller than the sum of its proper divisors (28152298528).

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

21201032240 is a wasteful number, since it uses less digits than its factorization.

21201032240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327597 (or 327591 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21201032240 its reverse (4223010212), we get a palindrome (25424042452).

The spelling of 21201032240 in words is "twenty-one billion, two hundred one million, thirty-two thousand, two hundred forty".