20201221002 has 64 divisors (see below), whose sum is σ = 43723468800. Its totient is φ = 6200504640.

The previous prime is 20201220961. The next prime is 20201221003. The reversal of 20201221002 is 20012210202.

It is not an unprimeable number, because it can be changed into a prime (20201221003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5561727 + ... + 5565357.

It is an arithmetic number, because the mean of its divisors is an integer number (683179200).

Almost surely, 2^20201221002 is an apocalyptic number.

20201221002 is an abundant number, since it is smaller than the sum of its proper divisors (23522247798).

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

20201221002 is a wasteful number, since it uses less digits than its factorization.

20201221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011.

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

Adding to 20201221002 its reverse (20012210202), we get a palindrome (40213431204).

The spelling of 20201221002 in words is "twenty billion, two hundred one million, two hundred twenty-one thousand, two".