221211221221002 has 32 divisors (see below), whose sum is σ = 469245328396992. Its totient is φ = 69281371199744.

The previous prime is 221211221220991. The next prime is 221211221221007. The reversal of 221211221221002 is 200122122112122.

It is a self number, because there is not a number n which added to its sum of digits gives 221211221221002.

It is not an unprimeable number, because it can be changed into a prime (221211221221007) 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, 1847246313 + ... + 1847366060.

It is an arithmetic number, because the mean of its divisors is an integer number (14663916512406).

Almost surely, 2^{221211221221002} is an apocalyptic number.

221211221221002 is an abundant number, since it is smaller than the sum of its proper divisors (248034107175990).

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

221211221221002 is a wasteful number, since it uses less digits than its factorization.

221211221221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3694612982.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221211221221002 its reverse (200122122112122), we get a palindrome (421333343333124).

The spelling of 221211221221002 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, two".