221621982002 has 4 divisors (see below), whose sum is σ = 332432973006. Its totient is φ = 110810991000.

The previous prime is 221621981969. The next prime is 221621982007. The reversal of 221621982002 is 200289126122.

It is a happy number.

221621982002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 119542371001 + 102079611001 = 345749^2 + 319499^2 .

It is not an unprimeable number, because it can be changed into a prime (221621982007) 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 as a sum of consecutive naturals, namely, 55405495499 + ... + 55405495502.

Almost surely, 2^221621982002 is an apocalyptic number.

221621982002 is a deficient number, since it is larger than the sum of its proper divisors (110810991004).

221621982002 is a wasteful number, since it uses less digits than its factorization.

221621982002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110810991003.

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 221621982002 in words is "two hundred twenty-one billion, six hundred twenty-one million, nine hundred eighty-two thousand, two".