20102301221 has 4 divisors (see below), whose sum is σ = 20121248844. Its totient is φ = 20083353600.

The previous prime is 20102301203. The next prime is 20102301251. The reversal of 20102301221 is 12210320102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13490822500 + 6611478721 = 116150^2 + 81311^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102301221 - 2¹⁴ = 20102284837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20102301196 and 20102301205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102301251) 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, 9472220 + ... + 9474341.

It is an arithmetic number, because the mean of its divisors is an integer number (5030312211).

Almost surely, 2^20102301221 is an apocalyptic number.

It is an amenable number.

20102301221 is a deficient number, since it is larger than the sum of its proper divisors (18947623).

20102301221 is a wasteful number, since it uses less digits than its factorization.

20102301221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18947622.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20102301221 its reverse (12210320102), we get a palindrome (32312621323).

The spelling of 20102301221 in words is "twenty billion, one hundred two million, three hundred one thousand, two hundred twenty-one".