20102221001221 has 4 divisors (see below), whose sum is σ = 20104199771200. Its totient is φ = 20100242231244.

The previous prime is 20102221001183. The next prime is 20102221001237. The reversal of 20102221001221 is 12210012220102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20102221001221 - 2¹¹ = 20102220999173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102221001195 and 20102221001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102221001281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989369751 + ... + 989390068.

It is an arithmetic number, because the mean of its divisors is an integer number (5026049942800).

Almost surely, 2^{20102221001221} is an apocalyptic number.

It is an amenable number.

20102221001221 is a deficient number, since it is larger than the sum of its proper divisors (1978769979).

20102221001221 is a wasteful number, since it uses less digits than its factorization.

20102221001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978769978.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20102221001221 its reverse (12210012220102), we get a palindrome (32312233221323).

The spelling of 20102221001221 in words is "twenty trillion, one hundred two billion, two hundred twenty-one million, one thousand, two hundred twenty-one".