21322040240 has 40 divisors (see below), whose sum is σ = 49723574928. Its totient is φ = 8503038720.

The previous prime is 21322040191. The next prime is 21322040249. The reversal of 21322040240 is 4204022312.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (21322040249) by changing a digit.

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, 376127 + ... + 429086.

Almost surely, 2^21322040240 is an apocalyptic number.

21322040240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21322040240 is an abundant number, since it is smaller than the sum of its proper divisors (28401534688).

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

21322040240 is a wasteful number, since it uses less digits than its factorization.

21322040240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805557 (or 805551 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21322040240 its reverse (4204022312), we get a palindrome (25526062552).

The spelling of 21322040240 in words is "twenty-one billion, three hundred twenty-two million, forty thousand, two hundred forty".