20010241221 has 32 divisors (see below), whose sum is σ = 29007665280. Its totient is φ = 12263069952.

The previous prime is 20010241151. The next prime is 20010241249. The reversal of 20010241221 is 12214201002.

It is not a de Polignac number, because 20010241221 - 2¹¹ = 20010239173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20010241221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010241291) 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, 617991 + ... + 649563.

It is an arithmetic number, because the mean of its divisors is an integer number (906489540).

Almost surely, 2^20010241221 is an apocalyptic number.

It is an amenable number.

20010241221 is a deficient number, since it is larger than the sum of its proper divisors (8997424059).

20010241221 is an equidigital number, since it uses as much as digits as its factorization.

20010241221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31670 (or 31636 counting only the distinct ones).

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

Adding to 20010241221 its reverse (12214201002), we get a palindrome (32224442223).

The spelling of 20010241221 in words is "twenty billion, ten million, two hundred forty-one thousand, two hundred twenty-one".