21268228260 has 48 divisors (see below), whose sum is σ = 61160533056. Its totient is φ = 5518242432.

The previous prime is 21268228253. The next prime is 21268228313. The reversal of 21268228260 is 6282286212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4787922 + ... + 4792361.

It is an arithmetic number, because the mean of its divisors is an integer number (1274177772).

Almost surely, 2^21268228260 is an apocalyptic number.

21268228260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21268228260 is an abundant number, since it is smaller than the sum of its proper divisors (39892304796).

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

21268228260 is a wasteful number, since it uses less digits than its factorization.

21268228260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9580332 (or 9580330 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The spelling of 21268228260 in words is "twenty-one billion, two hundred sixty-eight million, two hundred twenty-eight thousand, two hundred sixty".