20003200121 has 4 divisors (see below), whose sum is σ = 20038355700. Its totient is φ = 19968044544.

The previous prime is 20003200117. The next prime is 20003200159. The reversal of 20003200121 is 12100230002.

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 11122022521 + 8881177600 = 105461^2 + 94240^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003200121 - 2² = 20003200117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20003205121) 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, 17576936 + ... + 17578073.

It is an arithmetic number, because the mean of its divisors is an integer number (5009588925).

Almost surely, 2^20003200121 is an apocalyptic number.

It is an amenable number.

20003200121 is a deficient number, since it is larger than the sum of its proper divisors (35155579).

20003200121 is an equidigital number, since it uses as much as digits as its factorization.

20003200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35155578.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20003200121 its reverse (12100230002), we get a palindrome (32103430123).

The spelling of 20003200121 in words is "twenty billion, three million, two hundred thousand, one hundred twenty-one".