20200000121 has 4 divisors (see below), whose sum is σ = 23085714432. Its totient is φ = 17314285812.

The previous prime is 20200000099. The next prime is 20200000127. The reversal of 20200000121 is 12100000202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12100000202 = 2 ⋅6050000101.

It is a cyclic number.

It is not a de Polignac number, because 20200000121 - 2¹⁴ = 20199983737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20200000099 and 20200000108.

It is not an unprimeable number, because it can be changed into a prime (20200000127) 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, 1442857145 + ... + 1442857158.

It is an arithmetic number, because the mean of its divisors is an integer number (5771428608).

Almost surely, 2^20200000121 is an apocalyptic number.

It is an amenable number.

20200000121 is a deficient number, since it is larger than the sum of its proper divisors (2885714311).

20200000121 is an equidigital number, since it uses as much as digits as its factorization.

20200000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885714310.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 20200000121 its reverse (12100000202), we get a palindrome (32300000323).

The spelling of 20200000121 in words is "twenty billion, two hundred million, one hundred twenty-one", and thus it is an aban number.