221787852490 has 32 divisors (see below), whose sum is σ = 400132925136. Its totient is φ = 88512061440.

The previous prime is 221787852487. The next prime is 221787852557. The reversal of 221787852490 is 94258787122.

221787852490 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 202292153361 + 19495699129 = 449769^2 + 139627^2 .

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, 9301824 + ... + 9325636.

Almost surely, 2^221787852490 is an apocalyptic number.

221787852490 is a deficient number, since it is larger than the sum of its proper divisors (178345072646).

221787852490 is a wasteful number, since it uses less digits than its factorization.

221787852490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25914.

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 221787852490 in words is "two hundred twenty-one billion, seven hundred eighty-seven million, eight hundred fifty-two thousand, four hundred ninety".