221020021002 has 64 divisors (see below), whose sum is σ = 514612445184. Its totient is φ = 62539626240.

The previous prime is 221020020971. The next prime is 221020021003. The reversal of 221020021002 is 200120020122.

221020021002 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 (221020021003) 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 31 ways as a sum of consecutive naturals, for example, 633048 + ... + 918035.

It is an arithmetic number, because the mean of its divisors is an integer number (8040819456).

Almost surely, 2^221020021002 is an apocalyptic number.

221020021002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221020021002 is an abundant number, since it is smaller than the sum of its proper divisors (293592424182).

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

221020021002 is a wasteful number, since it uses less digits than its factorization.

221020021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551243.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 221020021002 its reverse (200120020122), we get a palindrome (421140041124).

The spelling of 221020021002 in words is "two hundred twenty-one billion, twenty million, twenty-one thousand, two".