20024010221 has 4 divisors (see below), whose sum is σ = 20025454812. Its totient is φ = 20022565632.

The previous prime is 20024010217. The next prime is 20024010239. The reversal of 20024010221 is 12201042002.

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 5459140996 + 14564869225 = 73886^2 + 120685^2 .

It is a cyclic number.

It is not a de Polignac number, because 20024010221 - 2² = 20024010217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20024010196 and 20024010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20024010821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701300 + ... + 729293.

It is an arithmetic number, because the mean of its divisors is an integer number (5006363703).

Almost surely, 2^20024010221 is an apocalyptic number.

It is an amenable number.

20024010221 is a deficient number, since it is larger than the sum of its proper divisors (1444591).

20024010221 is a wasteful number, since it uses less digits than its factorization.

20024010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444590.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20024010221 its reverse (12201042002), we get a palindrome (32225052223).

The spelling of 20024010221 in words is "twenty billion, twenty-four million, ten thousand, two hundred twenty-one".