221949861282 has 18 divisors (see below), whose sum is σ = 480895696827. Its totient is φ = 73982620836.

The previous prime is 221949861271. The next prime is 221949861317. The reversal of 221949861282 is 282168949122.

221949861282 is a `hidden beast` number, since 2 + 2 + 19 + 4 + 9 + 8 + 612 + 8 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 110974930641 + 110974930641 = 333129^2 + 333129^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333129.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1943253 + ... + 2054295.

Almost surely, 2^221949861282 is an apocalyptic number.

221949861282 is an abundant number, since it is smaller than the sum of its proper divisors (258945835545).

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

221949861282 is an frugal number, since it uses more digits than its factorization.

221949861282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222094 (or 111048 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The spelling of 221949861282 in words is "two hundred twenty-one billion, nine hundred forty-nine million, eight hundred sixty-one thousand, two hundred eighty-two".