221221012002 has 128 divisors (see below), whose sum is σ = 503175628800. Its totient is φ = 64417305600.

The previous prime is 221221011989. The next prime is 221221012007. The reversal of 221221012002 is 200210122122.

It is not an unprimeable number, because it can be changed into a prime (221221012007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35557252 + ... + 35563472.

It is an arithmetic number, because the mean of its divisors is an integer number (3931059600).

Almost surely, 2^221221012002 is an apocalyptic number.

221221012002 is an abundant number, since it is smaller than the sum of its proper divisors (281954616798).

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

221221012002 is a wasteful number, since it uses less digits than its factorization.

221221012002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632.

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

Adding to 221221012002 its reverse (200210122122), we get a palindrome (421431134124).

The spelling of 221221012002 in words is "two hundred twenty-one billion, two hundred twenty-one million, twelve thousand, two".