21260202240 has 72 divisors (see below), whose sum is σ = 67899783168. Its totient is φ = 5669386240.

The previous prime is 21260202233. The next prime is 21260202241. The reversal of 21260202240 is 4220206212.

It is not an unprimeable number, because it can be changed into a prime (21260202241) 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, 2764416 + ... + 2772095.

It is an arithmetic number, because the mean of its divisors is an integer number (943052544).

Almost surely, 2^21260202240 is an apocalyptic number.

21260202240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21260202240 is an abundant number, since it is smaller than the sum of its proper divisors (46639580928).

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

21260202240 is an equidigital number, since it uses as much as digits as its factorization.

21260202240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5536535 (or 5536521 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21260202240 its reverse (4220206212), we get a palindrome (25480408452).

The spelling of 21260202240 in words is "twenty-one billion, two hundred sixty million, two hundred two thousand, two hundred forty".