20020222121 has 8 divisors (see below), whose sum is σ = 20321094024. Its totient is φ = 19721363200.

The previous prime is 20020222111. The next prime is 20020222139. The reversal of 20020222121 is 12122202002.

It can be written as a sum of positive squares in 4 ways, for example, as 16445497600 + 3574724521 = 128240^2 + 59789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020222121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020222096 and 20020222105.

It is not an unprimeable number, because it can be changed into a prime (20020222111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483200 + ... + 522993.

It is an arithmetic number, because the mean of its divisors is an integer number (2540136753).

Almost surely, 2^20020222121 is an apocalyptic number.

It is an amenable number.

20020222121 is a deficient number, since it is larger than the sum of its proper divisors (300871903).

20020222121 is a wasteful number, since it uses less digits than its factorization.

20020222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006491.

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

Adding to 20020222121 its reverse (12122202002), we get a palindrome (32142424123).

The spelling of 20020222121 in words is "twenty billion, twenty million, two hundred twenty-two thousand, one hundred twenty-one".