21761132260 has 36 divisors (see below), whose sum is σ = 53159339772. Its totient is φ = 7460959296.

The previous prime is 21761132257. The next prime is 21761132299. The reversal of 21761132260 is 6223116712.

It can be written as a sum of positive squares in 2 ways, for example, as 12983690916 + 8777441344 = 113946^2 + 93688^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11101639 + ... + 11103598.

It is an arithmetic number, because the mean of its divisors is an integer number (1476648327).

Almost surely, 2^21761132260 is an apocalyptic number.

21761132260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21761132260 is an abundant number, since it is smaller than the sum of its proper divisors (31398207512).

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

21761132260 is a wasteful number, since it uses less digits than its factorization.

21761132260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22205260 (or 22205251 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

Adding to 21761132260 its reverse (6223116712), we get a palindrome (27984248972).

The spelling of 21761132260 in words is "twenty-one billion, seven hundred sixty-one million, one hundred thirty-two thousand, two hundred sixty".