221001001988 has 48 divisors (see below), whose sum is σ = 420679284480. Its totient is φ = 100978061184.

The previous prime is 221001001987. The next prime is 221001001993. The reversal of 221001001988 is 889100100122.

221001001988 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221001001987) 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 15 ways as a sum of consecutive naturals, for example, 28045433 + ... + 28053311.

It is an arithmetic number, because the mean of its divisors is an integer number (8764151760).

Almost surely, 2^221001001988 is an apocalyptic number.

It is an amenable number.

221001001988 is a deficient number, since it is larger than the sum of its proper divisors (199678282492).

221001001988 is a wasteful number, since it uses less digits than its factorization.

221001001988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13236 (or 13234 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 221001001988 in words is "two hundred twenty-one billion, one million, one thousand, nine hundred eighty-eight".