221221010202 has 16 divisors (see below), whose sum is σ = 442446775200. Its totient is φ = 73739544272.

The previous prime is 221221010123. The next prime is 221221010203. The reversal of 221221010202 is 202010122122.

221221010202 is digitally balanced in base 2, because in such base 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 (221221010203) 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, 772549 + ... + 1019447.

It is an arithmetic number, because the mean of its divisors is an integer number (27652923450).

Almost surely, 2^221221010202 is an apocalyptic number.

221221010202 is an abundant number, since it is smaller than the sum of its proper divisors (221225764998).

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

221221010202 is a wasteful number, since it uses less digits than its factorization.

221221010202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396237.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221221010202 its reverse (202010122122), we get a palindrome (423231132324).

The spelling of 221221010202 in words is "two hundred twenty-one billion, two hundred twenty-one million, ten thousand, two hundred two".