221021220001002 has 16 divisors (see below), whose sum is σ = 447637913927040. Its totient is φ = 72741161012832.

The previous prime is 221021220000991. The next prime is 221021220001003. The reversal of 221021220001002 is 200100022120122.

It is not an unprimeable number, because it can be changed into a prime (221021220001003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233144746363 + ... + 233144747310.

It is an arithmetic number, because the mean of its divisors is an integer number (27977369620440).

Almost surely, 2^{221021220001002} is an apocalyptic number.

221021220001002 is an abundant number, since it is smaller than the sum of its proper divisors (226616693926038).

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

221021220001002 is a wasteful number, since it uses less digits than its factorization.

221021220001002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466289493757.

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

Adding to 221021220001002 its reverse (200100022120122), we get a palindrome (421121242121124).

The spelling of 221021220001002 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty million, one thousand, two".