221421255546678 has 64 divisors (see below), whose sum is σ = 488340507329280. Its totient is φ = 66370872816000.

The previous prime is 221421255546649. The next prime is 221421255546679. The reversal of 221421255546678 is 876645552124122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421255546679) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 8410300 + ... + 22662207.

It is an arithmetic number, because the mean of its divisors is an integer number (7630320427020).

Almost surely, 2^{221421255546678} is an apocalyptic number.

221421255546678 is an abundant number, since it is smaller than the sum of its proper divisors (266919251782602).

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

221421255546678 is a wasteful number, since it uses less digits than its factorization.

221421255546678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31073693.

The product of its digits is 64512000, while the sum is 60.

The spelling of 221421255546678 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-six thousand, six hundred seventy-eight".