221421255544788 has 36 divisors (see below), whose sum is σ = 559448971115328. Its totient is φ = 68129617090080.

The previous prime is 221421255544787. The next prime is 221421255544823. The reversal of 221421255544788 is 887445552124122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421255544787) 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 11 ways as a sum of consecutive naturals, for example, 54591037308 + ... + 54591041363.

It is an arithmetic number, because the mean of its divisors is an integer number (15540249197648).

Almost surely, 2^{221421255544788} is an apocalyptic number.

It is an amenable number.

221421255544788 is an abundant number, since it is smaller than the sum of its proper divisors (338027715570540).

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

221421255544788 is a wasteful number, since it uses less digits than its factorization.

221421255544788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109182078704 (or 109182078689 counting only the distinct ones).

The product of its digits is 57344000, while the sum is 60.

The spelling of 221421255544788 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-four thousand, seven hundred eighty-eight".