221021294600 has 48 divisors (see below), whose sum is σ = 513906365700. Its totient is φ = 88403037440.

The previous prime is 221021294597. The next prime is 221021294621. The reversal of 221021294600 is 6492120122.

It can be written as a sum of positive squares in 6 ways, for example, as 91635765796 + 129385528804 = 302714^2 + 359702^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5178146 + ... + 5220654.

Almost surely, 2^221021294600 is an apocalyptic number.

221021294600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021294600 is an abundant number, since it is smaller than the sum of its proper divisors (292885071100).

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

221021294600 is a wasteful number, since it uses less digits than its factorization.

221021294600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68522 (or 68513 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 221021294600 in words is "two hundred twenty-one billion, twenty-one million, two hundred ninety-four thousand, six hundred".