221012761250 has 30 divisors (see below), whose sum is σ = 414297476901. Its totient is φ = 88398456000.

The previous prime is 221012761219. The next prime is 221012761289. The reversal of 221012761250 is 52167210122.

It is a happy number.

221012761250 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 158067470929 + 62945290321 = 397577^2 + 250889^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332425.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

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 14 ways as a sum of consecutive naturals, for example, 16614602 + ... + 16627898.

Almost surely, 2^221012761250 is an apocalyptic number.

221012761250 is a deficient number, since it is larger than the sum of its proper divisors (193284715651).

221012761250 is an frugal number, since it uses more digits than its factorization.

221012761250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26616 (or 13304 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 221012761250 its reverse (52167210122), we get a palindrome (273179971372).

The spelling of 221012761250 in words is "two hundred twenty-one billion, twelve million, seven hundred sixty-one thousand, two hundred fifty".