221251255240 has 64 divisors (see below), whose sum is σ = 533021180400. Its totient is φ = 82358673408.

The previous prime is 221251255229. The next prime is 221251255243. The reversal of 221251255240 is 42552152122.

221251255240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 56540279524 + 164710975716 = 237782^2 + 405846^2 .

It is not an unprimeable number, because it can be changed into a prime (221251255243) 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, 1767399 + ... + 1888438.

Almost surely, 2^221251255240 is an apocalyptic number.

221251255240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221251255240 is an abundant number, since it is smaller than the sum of its proper divisors (311769925160).

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

221251255240 is a wasteful number, since it uses less digits than its factorization.

221251255240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655954 (or 3655950 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 221251255240 in words is "two hundred twenty-one billion, two hundred fifty-one million, two hundred fifty-five thousand, two hundred forty".