21522304240 has 40 divisors (see below), whose sum is σ = 50080700880. Its totient is φ = 8601808896.

The previous prime is 21522304201. The next prime is 21522304241. The reversal of 21522304240 is 4240322512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522304241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13170 + ... + 207889.

It is an arithmetic number, because the mean of its divisors is an integer number (1252017522).

Almost surely, 2^21522304240 is an apocalyptic number.

21522304240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21522304240 is an abundant number, since it is smaller than the sum of its proper divisors (28558396640).

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

21522304240 is a wasteful number, since it uses less digits than its factorization.

21522304240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222289 (or 222283 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21522304240 its reverse (4240322512), we get a palindrome (25762626752).

The spelling of 21522304240 in words is "twenty-one billion, five hundred twenty-two million, three hundred four thousand, two hundred forty".