21254556260 has 48 divisors (see below), whose sum is σ = 51032903040. Its totient is φ = 7284138240.

The previous prime is 21254556233. The next prime is 21254556263. The reversal of 21254556260 is 6265545212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21254556263) by changing a digit.

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, 306056 + ... + 369024.

It is an arithmetic number, because the mean of its divisors is an integer number (1063185480).

Almost surely, 2^21254556260 is an apocalyptic number.

21254556260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21254556260 is an abundant number, since it is smaller than the sum of its proper divisors (29778346780).

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

21254556260 is a wasteful number, since it uses less digits than its factorization.

21254556260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65396 (or 65394 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 21254556260 in words is "twenty-one billion, two hundred fifty-four million, five hundred fifty-six thousand, two hundred sixty".