221925876642 has 54 divisors (see below), whose sum is σ = 494351021619. Its totient is φ = 71951976000.

The previous prime is 221925876631. The next prime is 221925876647. The reversal of 221925876642 is 246678529122.

221925876642 is a `hidden beast` number, since 2 + 2 + 19 + 2 + 587 + 6 + 6 + 42 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 203492112201 + 18433764441 = 451101^2 + 135771^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333111.

It is not an unprimeable number, because it can be changed into a prime (221925876647) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 73949142 + ... + 73952142.

Almost surely, 2^221925876642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221925876642

221925876642 is an abundant number, since it is smaller than the sum of its proper divisors (272425144977).

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

221925876642 is an frugal number, since it uses more digits than its factorization.

221925876642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6084 (or 3043 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 221925876642 in words is "two hundred twenty-one billion, nine hundred twenty-five million, eight hundred seventy-six thousand, six hundred forty-two".