221222201199978 has 128 divisors (see below), whose sum is σ = 494069597374464. Its totient is φ = 65465621395200.

The previous prime is 221222201199977. The next prime is 221222201200073. The reversal of 221222201199978 is 879991102222122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221222201199977) 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 63 ways as a sum of consecutive naturals, for example, 877945488 + ... + 878197428.

It is an arithmetic number, because the mean of its divisors is an integer number (3859918729488).

Almost surely, 2^{221222201199978} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221222201199978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247034798687232).

221222201199978 is an abundant number, since it is smaller than the sum of its proper divisors (272847396174486).

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

221222201199978 is a wasteful number, since it uses less digits than its factorization.

221222201199978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253180.

The product of its (nonzero) digits is 2612736, while the sum is 57.

The spelling of 221222201199978 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred one million, one hundred ninety-nine thousand, nine hundred seventy-eight".