20001010221 has 24 divisors (see below), whose sum is σ = 30749981184. Its totient is φ = 12483930240.

The previous prime is 20001010219. The next prime is 20001010273. The reversal of 20001010221 is 12201010002.

It is not a de Polignac number, because 20001010221 - 2¹ = 20001010219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001010021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 312991 + ... + 371436.

It is an arithmetic number, because the mean of its divisors is an integer number (1281249216).

Almost surely, 2^20001010221 is an apocalyptic number.

It is an amenable number.

20001010221 is a deficient number, since it is larger than the sum of its proper divisors (10748970963).

20001010221 is a wasteful number, since it uses less digits than its factorization.

20001010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684641 (or 684638 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20001010221 its reverse (12201010002), we get a palindrome (32202020223).

The spelling of 20001010221 in words is "twenty billion, one million, ten thousand, two hundred twenty-one".