221428185406892 has 48 divisors (see below), whose sum is σ = 418010072205600. Its totient is φ = 102249824947200.

The previous prime is 221428185406861. The next prime is 221428185406927. The reversal of 221428185406892 is 298604581824122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61652642 + ... + 65145257.

It is an arithmetic number, because the mean of its divisors is an integer number (8708543170950).

Almost surely, 2^{221428185406892} is an apocalyptic number.

It is an amenable number.

221428185406892 is a deficient number, since it is larger than the sum of its proper divisors (196581886798708).

221428185406892 is a wasteful number, since it uses less digits than its factorization.

221428185406892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126798402 (or 126798400 counting only the distinct ones).

The product of its (nonzero) digits is 35389440, while the sum is 62.

The spelling of 221428185406892 in words is "two hundred twenty-one trillion, four hundred twenty-eight billion, one hundred eighty-five million, four hundred six thousand, eight hundred ninety-two".