221790990640 has 40 divisors (see below), whose sum is σ = 517150181520. Its totient is φ = 88460718336.

The previous prime is 221790990623. The next prime is 221790990643. The reversal of 221790990640 is 46099097122.

221790990640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (221790990643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3967035 + ... + 4022554.

It is an arithmetic number, because the mean of its divisors is an integer number (12928754538).

Almost surely, 2^221790990640 is an apocalyptic number.

221790990640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221790990640 is an abundant number, since it is smaller than the sum of its proper divisors (295359190880).

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

221790990640 is a wasteful number, since it uses less digits than its factorization.

221790990640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7989949 (or 7989943 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 221790990640 in words is "two hundred twenty-one billion, seven hundred ninety million, nine hundred ninety thousand, six hundred forty".